Consider getting a Portaboat.

http://www.porta-bote.com/

My first 'boat' was a used 12' Portaboat. I used 2 deep cycle batteries
and an old 27# Minn Kota and it did great. Lots more stable than a
canoe and light enough so I could carry it by myself. A 12 footer will
comfortably seat 2 adults and has a capacity of 670 pounds. They come
with 2 - 2 piece oars and oar locks although only the kids ever used
the oars for fun. I still have mine in the backyard. Takes up hardly
any space and I like having a backup. Here's a Yahoo group where you
can find more info.

http://groups.yahoo.com/group/PortaBote/

Another nice feature of a folding boat is than you can strap it to the
roof of your car and do 70+mph on the freeway if you propery secure it.
d:^)

-phish