I am going on a 311 party cruise next week! Help me!

Of course there will be drinking, lots of drinking and eating ugh. There is 24 hour room service, you can eat as much at you want at sit down meals and everything else is buffet! Ugh I've been planning this for a very long time, but now I feel like all Im going to do is get set back. Any suggestiions or tips on what to do on a cruise will be greatly appreciated :) P.S is anybody on MFP going on the same 311 cruise out of Miami? If so maybe we can be exercise buddies for the duration :)