I was very underwhelmed by the Tetons float trip (although we did see a grizzly - from the van). We had already been through Custer and Yellowstone, so seeing elk and eagles wasn't really a stand-out. The trip was pleasant and the kids enjoyed it, but if I had it to do over again I'd rent a canoe from Jenny Lake or Signal Mountain and get our water fix on the lake instead (for far less $$$).

ETA: We stayed in a cabin at Signal Mountain and were very happy. It's a cabin though, the folks next door seemed to think they were renting the Ritz and were disappointed.