What can I do in Atlantis resort in Bahamas being 18?

I'm going to Atlantis from 6/25 to 6/30 approximately and I want to know what can I do being 18.. I really love nightlife, and I've seen Crush teen club but I think it wouldn't be cool for me.. I have a brother that is 16 and he is just like me (although he has a girlfriend ha ha), so I'll be there with him.. I don't know if I can get into the Crush teen club being 18, and if i'm too big for people in there, I want to meet girls and make some friends since I'm from Uruguay.. Thanks!!