Thanks you guys all good info. I think I'll prob buy a 4wheeler from Belize City that sounds like the best way to go.

Tacky...no class....Why?

You will need permission from the Traffic Comittee to bring the 4-wheeler to San Pedro. Don't go shopping for a vehicle until you know you can have it on the island. As a visitor on a tourist visa you will probably not get such permission for yourself, and therefore the advice to search things out here before you make an investment. Strongly suggest that you check with somebody who already has one legally on island and see what arrangements you can make. A regular bicycle is a pretty nice way to travel - and you being an athletic kind of person it might be a simple and enjoyable alternative.

Just wondering, how about a motorcycle?

All motorized vehicles require a permit.