I used to rent one all the time with about 9 of my closest friends... always a good time. Forever Resorts is the name of the rental place. One word of caution about the bars... NONE of them will let you tie off on their docks. The houseboats are way too big, we learned the hard way. Plus, you can't operate one after sunset. One idea is to rent one, find a place to park it for the weekend and have a run-about to get you to / from the bars.
My best advice: Purchase the damage waiver!!!!