Tim found this really cool transparent canoe that looks like it would be fun to have in a place where there was clear water. I noticed that the water around here is much clearer in the winter than at other times of of the year. I'm sure it has to do with currents, growth and death of sea plants, pollen, etc.
Here's a site that has the canoe, a folding kayak that weighs only 26 lbs, and a clear-bottom folding kayak that only weights 21 lbs.
Doesn't that look like fun!