My dad lived out in Vegas, so I used to go there on a regular basis. Never drank especially, tho. I can't stand casinos, for the most part. Too loud. Depression has made loud noise intolerable for me. I much prefer places like Red Rock, where there is quiet and a beautiful desert landscape.
Everything incorporates drinking there. On the casino floor, they bring you free drinks if you are playing. Shows serve drinks, and often have drink minimums. There is also, obviously, drinking in the restaurants. If you're really concerned about giving in and taking that first drink, you might start looking for excuses not to go.
Rev