I usually go two Weeks and partying hard day and night everyday you need a break, you don't have go to another resort just stay in the room and watch TV i am sure you'll find something good to put on
And regarding your query as to when to take it easy. I recommend starting slowly, dipping your toe into the water your first, say three days there, and then saving the last few for rest, relaxation and re-acclimating to the real world. The fact that that would mean your adventurous party days would be Sept 1-10, which happens to align exactly with my dates is, I assure you, purely coincidental indeed. ;-) Seriously, some of the Brits (who tend to be the ones who are there two weeks) hang at the quiet pool or Score (the sports bar). I do not recommend you spend time watching tele in your room all day unless it's raining or you have company. ;-)