see //AmbergrisCaye.com/thunderbolt/ for info on the boat, its a nice trip, not hairy or crazy or anything. lil slower than the plane, you have to get from the int'l airport down to the water in Belize City, but quite do-able.
if you want a nice colorful clickable adobe acrobat PDF on the island, and a nice big text file full of link information, email me at email@example.com and i'll send it along!
Here is the acrobat document:
here is the text file full of links to major areas of this site: