There is so much to do. I think I got mild tendonitis in my right elbow from holding a drink so much of the time last time I was there. I am a lazy vacationer, it goes like this for me:

Wake up (morning sex pleasee!), eat something, drink at pool, lunch at 2 or 3 (whenever you get too hot), siesta, happy hour (hotel room shots typically if with friends), dinner and maybe gamble until 9 or 10, back to room change into your fancy stuff (clubs won't let you in unless you are dressed nice, no shorts and your shirt should have a collar), then to the club.

There are a lot of clubs to choose from, table service starts about $700 so if there are just two of you, that is not an option. Tons of crazy sh!t happens in those clubs, the best people watching of the day is between midnight and 2 am (hundreds of drunk young people crammed together dancing to horrible music anyone?). Obviously Fri and Sat nights are best to join in the fun.