Hello, we did the Mendenhall float trip, july 05. They give you rain gear and waterproof boots to wear, if you want to. Well, the raingear was great. The waterproof boots, were not that great. They suggest you bring a second pair of socks. I didn't!! The boots, must of had little holes in them, just enough to let small amount of water in. By the end of the trip, my feet felt FROZEN, very cold.
We drove out to the lake in front of the glacier, and put our gear on. We got in the raft, and paddled out closed to the glacier. Now, I had no idea what to expect, and we did not get as close as I thought we would of. I was a little disappointed at that. We then turn our raft around, and started heading downstream. The rapids were pretty benign, I thought. I have rafted the Kern River before, so I was able to compare the rafting. I don't know what class the rapids were. If I had to guess, I would say class I-II. After awhile, the scenic riverside turned into backyards of houses. There are houses that live along the river. Little kids would wave to us. I don't remember how long it was either. But, after my feet feeling frozen, I remember I was ready to get off when it ended. It was neat to do. Definately bring an extra pair of socks. Your feet will thank you.
We also did the helicopter out to the glacier with a glacier walkabout. Expensive, but oh so worth it. That was awesome.
Hope my info helps. Lil' Lori