At the risk of incurring someone's (everyone's?) wrath, I'll say that one of the things I love best about Belize is that it is NOT on everyone's mental geography map, nor in their travel plans, whence comes much of its appeal.
The planet's loveliest places can and often have lost their character and charm by being overwhelmed by too many tourists. Note the posts from those wanting to know which day cruise ships are in Belize so as to AVOID booking mainland excursions on those days.
May Ambergris Caye remain a gem of tranquility!