I went there for my stag do 2 years ago mate it's the best place on earth! I've been 3 times now and going back in the summer. The pool parties are phenomenal! The day life is better than the night life IMO. You have to go to Wet republic on a Saturday. Rehab on a Sunday is a must as well. Other good pool parties are Tao beach at the Venetian , encore beach club at the Encore. If your in a group of blokes with no women with ya you are going to need to pay for table service to guarantee entrance to the clubs and the pool parties. We do this every year. Basically you get given a minimum spend for your party which you must hit. Different clubs charge different amounts. The top clubs will be around 5k for a table which you can probably get 10 blokes on. It's worth every penny as you get walked straight to the front of the que (which can save you a couple of hours queuing) and you get your own waitress who is at your beck and call all night which saves pissing around trying to get served at the bar.
You will have the time of your life mate! Where you staying?