Ha-ha. I live in the mountains, where they rent cabins with lofts that have wide open floor plans.
If you find you cant sleep, do you have an area where you can watch tv or something, where you wont disturb anyone else?
The activities at the water park would be an awesome way to kick start your endorphins. And the hot tub will sweat out the opiates. The benefits of both outweigh the worries over keeping your roommate awake. In other words, you stand to gain more than they will lose.