Jeff,
You might want to check out Native Watercraft's Ultimate 14.5. It's a "hybrid." It's sort of a cross between a kayak and canoe. They come in tandem and solo. If you get the tandem, you and your son can go. You can convert it to a solo in about 5 minutes.
Great boat. Paddles nicely, tracks straight and is fairly fast. Also, lot of room for gear.
Link: http://www.nativewatercraft.com/ult_14T.cfm
I highly recommend this over a canoe.