//ambergriscaye.com/maps/index.html
Marty provides some great maps and illustrations on this website.

Nannahead the tide changes are much easier to sea where the beach is not raked or cleaned. Also Ambergris Caye is protected by the 2nd largest barrier reef in the world, largest in the northern hemisphere. The Barrier Reef causes shallow water from the reef to the shore. The other side of the reef can drop off hundreds of feet. This can be seen by strong snorkelers and divers at Hol Chan, San Pedro Cut & other areas. There is a cross cut view on the map page above.
Belize it!