Sundays is the main day to go. Last few years it has been run by Pacha NYC. It's loud and crazy, no dress code really. Some people come and lay on the beach, and then go party inside wearing the same clothes. So you will see people in just bikinis or topless guys in swim trunks. Almost every guy there looks like he can step on a bodybuilding stage or do a fitness modeling photoshoot. A lot of fake boobies around as well. It's very fun, loud and exciting. The bathroom lines for girls are crazy, so be aware. On a big dj night you can spend up to 20 minutes just waiting on line.
Leave as soon as it gets dark outside to avoid the drugged out "afterhours" scene. Unless that's your cup of tea.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.