I had a 21' boat, (Corona made by seahart) that I needed to junk. I stripped the boat and sold the out drive and motor. The small pieces (seats, pumps, guages, etc) I tossed in the garbage. When I got down to the hull I cut it up with a sawsall and put the pieces in my dumpster at work. I would think you could do the same and bring the boat piece by piece to your local garbage dump.
Walter