The Rainforest Cafe at the MGM Grand in Vegas is pretty cool. I really like the environment - nice little rainforest environment, and they re-create it well. Their is a very forest-y ambiance in there and it's pretty relaxing when you're eating lunch.
I ordered a sandwich (I don't remember which kind because it was a while ago) but I remember being satisfied with the food. The service was good (I still remember that) and all around I think this place is definitely worth a visit, especially if you are in the area.