I went tubing on the Hudson River with TubbyTubes today. It has been a long time since I had so much fun. I am an Aquarius, so I love being in the water, but you don't have to be one to appreciate this kind of trip. I took the 2 hr. trip, but next time I will definitely take the 4 hr. one.
Tubby Tubes has rafting and tubing trips and rents kayaks and canoes. The trips leave from their headquarters, and you are taken by bus to the river or lake, depending on what you choose. The guides are helpful and full of fun.
They have a helpful and colorful web page too--Tubbytubes.com, which lists trips and prices and has pictures of the trips.
Give them a try if you are in the Adirondacks.