My sister and I did this tour a couple of years ago and of all the excursions - this one was THE BEST! The entire thing was wonderful from the catamaran to Haines the bus ride and of course the float down the river. They equip you with jackets and boots (because it can be chilly). We saw many eagles and were lucky enough to see a brown bear with her cubs.
The river is not very fast and is very shallow, so sometimes you feel your butt scraping the along the riverbed.
The lunch at the end of the float was excellent.
I am doing the Alaskan trip again this coming September (with my hubby and his family). We are going to do the bike ride in Skagway - coasting down the mountain to the ship.
Have a great cruise.