I went a couple of years ago with 6 mates. As long as you leave your principles and morals at home you'll have a blast! I went for 7 nights and when you're getting in at 6 every morning you will be ready for home after that! If you plan on getting plastered every night you probably won't want to do an awful lot of activities. We went on an organised day to a water park which was brilliant. They shut the park off to the public after a certain time and we had unlimited sangria in the price we paid and they left some of the slides open. People went down the slides together, straight after each other all peed up... It was chaos. Would never happen in England. Majority of other days we just recovered at the beach, pool or just like playing table tennis or whatever.
Also I would add to be sensible to a certain extent. One of my mates got beaten up by a security guard after jumping in the pool in middle of night, heard of quite a few pick pockets and a random kid walked in our room too. Also I'd pre drink to keep costs down!