Romulans, also known as Rihannsu, were originally Vulcans.  Romulans look like Vulcans  but they have a slightly different forehead structure. Males have softer facial features than Vulcans.  The height of Rihannsu males range between 5'7" to 6'3" and their weight is between 145 to 250 pounds.  The males have strength two to three times stronger than that of the average non-Rihannsu humanoids.  The height of Rihannsu females range from 5'6" to 5'9" and weigh between 126 to 165 pounds.  There are a few exceptions as in any race, however Rihannsu females are, like the males, generally of greater strength than those of other races.  Rihannsu blood is different from Terrans as Romulans have green blood based on  copper instead of red based on iron.

The Romulan physiology is not completely identical of Vulcans. Because of two millennia of separation from their Vulcan ancestors Rihannsu people have developed in an different way. Vulcans have more pointed ears than Romulans and have slightly darker skins than Romulans. This is because Vulcan is a dryer and hotter planet than Ch'Rihan and Ch'havran. The color of Romulan hair and eyes is either black or brown not like other humanoid races where hair and eye color varies in different colors. Romulans like Vulcans live much longer than Terrans. The maximum Rihannsu lifespan that can ever be expected is approximately 250 standard years, with more typical figures ranging from 200 to 230 or so. Generally, the last 10 to 25 of those years is spent in a weakened state, as is common with most races.

from the former site: http://www.romulanstarrepublic.org/society/romulansociety.html

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The family, service to the Empire, and mnhei'sahe, the Rihannsu concept of personal honor are great values in the Romulan culture. A Romulan family is very close and marriages are for life because the bond between husband and wife is so close that divorces and separation are not known in Romulan society, and failed marriages are taken as a taint upon the mnhei'sahe of both individuals. 

Every Romulan exists to serve and is willing to die for the Empire. A job in the military is one of the most prestigious jobs in the Romulan Star Empire and combat veterans are the most respected members of Romulan society.

http://www.geocities.com/Area51/Vault/5288/romulan.htm#history

Contrary to common belief, the Romulans as a people speak two major languages, Rihannsu (or Sav'lesta) and Rom'lesta (or Havrannsu). The former is more closely related to High Vulcan than the later and is the foremost language of the Senate, and the noble families and is predominant on Ch'Rihan. Most naval officers have at least a working knowledge of it, even if they are not native speakers. Rom'lesta is the language of the people, and is spoken by the majority of the Romulan people, and in particular by the natives of Ch'Havran.

Whilst most naval vessels, being primarily formed of crew from one of the twin worlds, will adopt the primary language of their world, but officers inevitably have a great working knowledge of both languages, and there are many loan words between the two. Typically the Rihannsu names for military ranks are of Rom'lesta descent, but Rihannsu versions of the Rom'lesta originals are the ranks in common use.

http://www.cix.co.uk/~mr-flibble/rpg/romulan/

Artistic abilities show the softer side of the Rihannsu personality, balancing their fierce warrior ethic with the sensitivity of an artist. Sculpting, pottery, and carving are the most popular media, as Rihannsu prefer to work in three-dimensional forms, although painting is a reasonably common artistic activity. In addition to the visual arts, the Rihannsu enjoy writing, literature, poetry, drama, and lhi, a game of wits and riddles.

From the former Trekmuse website http://www.trekmuse.org/romulan/

Lhi -- a game of wits and riddles
Trayatik -- a dice throwing game, much like craps

Khariat -- a stacking game, much like Earth's 'Jenga'.  Here are the rules:

SETUP
1. One player builds the tower on a flat, sturdy surface by using the loading tray as shown below. Place three blocks in each layer, at right angles to the previous layer. When you finish you'll have a solid, 18-story tower that can more than double during play!
2. Use the loading tray to set the tower upright Then carefully slide the tray away, and put it aside.

PLAY
1. The player who built the tower goes first. Play then continues to the left.
2. On your turn, carefully remove a block from anywhere BELOW the highest completed story Then stack it on top of the tower, at right angles to the blocks just below it.
3. Removing and Stacking Blocks
    *Remove and stack one block per turn. To remove a block, use one hand at a time. You can switch hands whenever you wish.
    *As play proceeds and the weight of the tower shifts, some blocks become looser than others and are easier to remove. You can touch other blocks to find a
     loose one - but if you move a block out of place, you must fix it (using one hand only) before touching another block.
    *While stacking, always complete one 3 - block story before starting a higher one.
4. Your turn ends 10 seconds after you stack your block-or as soon as the player to your left touches a block.
5. Keep removing and stacking blocks until the tower falls. A real pro can build a tower 36 stories high - or more!

WHO WINS?
The last player to take a turn without making the tower fall wins the game. The player responsible for making the tower, fall gets to set up the tower for the next game!
SOLO PLAY: Play alone for practice. Can you top your record height before the tower falls!
 

To play An`haih you need a bowl, made out of stone or wood, not ceramic. You also need five or six flat stones. For each of these stones, paint one side black and one side white. Put the stones inside the bowl, then hit the bottom of the bowl on the ground to make the stones jump (but not so hard that the stones jump clear out of the bowl!). The goal is to get all the stones to land with the same color facing up. You may also play this game by holding the stones in your hand, then tossing them on to a cloth laid out on the ground or a table

Lahal is a two-player game played with two bones (or sticks) that are small enough to fit in the palm of your hand. One of the bones is painted white and the other is white with a stripe around the center of it. One player would hold both bones, one in each hand, and shuffle them back and forth. The object of the game is to guess which hand the white bone is in. Each time the player guessed right he or she would get a point. If the player guessed wrong then he or she would lose a point. To win the game the player had to get six points.
 

D'elo:
A large circle is drawn on the ground and the leader places sticks and stones on it, each one named after a prominent landmark in the area (or perhaps a constellation from a space-map). After studying the arrangement of the objects, the players turn their backs on the circle. The first player names an object on the line and continues to name objects in order until he or she makes a mistake. Then another player tries.

The first player to correctly name all the objects has the honor of arranging the pieces for the next game. If they all fail, the leader rearranges the objects and they try again. You can have as little or as many objects to identify within the circle as you like. You could use place names from around your town, or locations within the your house, or just about any location that you can think of.
 

Multi-D chess, Computer Simulated war games involving traditional and modern Romulan technology, a variety of 'blind chess formats, and a variety of card games all hold the attention of soldiers in the field, as well as those working at home. Most recently, 'portable' computer systems, developed using now outdated Tal`Shiar cipher systems, have become quite popular in the North and East. While these little devices can generate any number of puzzles for their player, most often they revolve around a simple 'layering' system, which grows in complexity (via speed, chance, and scale) over the course of the game. These systems are doubly popular, due to their ability to 'soft-link' with each other, which adds a considerably more challenging 'live' opponent to face.

Games section from:  A support site for the RSR sim. http://www.anzwers.org/free/rsrlibrary/misc.html

SPORTS

There are Arena games, similar to the Terran Olympics, where athletes (both men and women) show their prowess with various Rihannsu weapons and fighting techniques.

Blood sports, such as Ke'veshrek (similar to kick boxing. See military page for martial arts.) and Flitter racing (anti-grav speed way racing) are also extremely popular, and are often broadcast on a regular schedule all through out the Republic.

Rihannsu also relish nature and enjoy the beauty of it -- most are avid hikers, riders, or mountaineers.

ARTS

Artistic abilities show the softer side of the Rihannsu personality, balancing a fierce warrior ethic with the sensitivity of an artist. Sculpting, pottery, and carving are the most popular media -- Rihannsu prefer to work in 3 dimensional forms.

In addition to the visual arts, there is writing, literature, poetry, drama and Lhi, a game of wits and riddles. While less common, scroll painting (a mix of calligraphic writing and light painting) has a long tradition in the Rihannsu culture.

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