what is famous in las vegas?

Have him win you a jackpot and bring you all the money, hehe. Since I doubt he will do that, you can always ask him to bring you back some tokens from some of the casinos. There are gifts shops all over the place, he could get you a tshirt or a magnet for your fridge.

Many of the Casino are famous on their own. Perhaps you may want some playing cards that were actually used at a certain casino, they sell them in the gift shop, they punch a hole through the deck. Each hotel/casino has their own souveniers. The Boulder Dam is near if he is going to sightsee there he could bring you a souvenier from the Dam. Each hotel/ casino has their own chips with their name on it and several different demoninations starting at $1 value. Each hotel has there own t-shirts, jackets etc with their logo on it. The most famous hotels in Vegas are on the strip. Some of them include: New York New York, The Belagio, Paris, Mandalay Bay, Excalibur, Caesars, The Venetian, The Luxor(hey do you like pyramids?), Treasure Island, and the Mirage to mention a few. Is this your brother's first trip to Las Vegas? It is a fun town but you want to limit your stay. Hope he has fun and you get a nice gift.

I think the most famous is the casino in Las Vegas.

CASINO mate!