Priscilla, our Regent cruise to Alaska was way back in 2001, before LCT began. As Eric mentioned, I also found a wealth of information re excursions on the cc Alaska forum.

Our two favorite excursions were booked independently and were a floatplane out of Ketchikan and an extended helicopter tour over and onto the glaciers out of Juneau. Despite my arthritic right knee I was able to walk on the glacier with the others. I kind of freaked out when our pilot jumped over a small crevice and instructed us to follow him, but I was able to do it. As Pat said, the close-up views you get from the helicopter make the trip worthwhile even if you can't participate in the walk.