Call it wishful thinking, but I wouldn't be surprised- with the layout of the lazy river and all- if you could take your lazy river raft to every attraction and simply ride it up on a belt. Maybe just for the tube rides, but possible the body slides as well. Of course, you'd need a way to get those tubes down as well- but what an amazing "queue" that would be for every slide- simply stay in your tube, ride a ride, grab another tube floating by.