Hi and welcome to cruise chat.
Well, we did alaska last summer. We had a float plane excursion prebooked, and it was cancelled at the last minute due to weather. We were able to book a helicopter glacier walkabout on mendenhall glacier. We love helicopters, so we jumped at the chance. Anyways, it was really neat to walk on a glacier. They took us back into a little flat area of the glacier. It landed, dropped us off, and then flew back out. There were 4-5 helicopters all together. We walked around for 20 minutes. You can't walk around too far, and it is VERY uneven. There are lots of deep crevices with beautiful blue water in them. The guide showed a mark where the glacier was last year, and to where it had shrunk to now. It was sad.
It was a good visual to see how much it was shrinking a year. When the helicopters flew back into to get us, the sound was so awesome. It was echoing off the glacier walls. I felt like it was a war movie, with choppers trying to attack us.
The sound was awesome. Anyways, we also did the mendenhall river float trip, later that same day. We went out in a big raft, and floated out to the middle of the lake to look at the glacier wall. I was a little disappointed at this. I thought we would get much closer then we did. Then we started to float down the very cold river. They gave us raingear, and waterproof boots. Even with the boots, our feet got wet enough to freeze our feet. Our feet were the only part that were really cold. We did get a little wet also. As you start floating a ways down, you start to pass homes that live on the river. It was fun to do once. We have done several river raft trips, the rapids were pretty calm I thought. I would recommend the helicopter glacier walk, much more than I would the float trip. Hope this helps, Lil' Lori