I am thinking of doing Universal for 2 to 4 nights before heading to WDW for the rest of the trip. I wonder which on site hotel would be most fun for our family which includes two boys who will be 6 and 12 at the time. I am wondering about the Hard rock hotel. The oldest is just beginning to learn to play guitar and the youngest is beginning piano lessons. I think the Hard Rock is also the only one with a water slide? I personally would prefer one of the other two choices, but wonder what you all think?