San Pedro on Ambergris Caye, followed by Caye Caulker and San Ignacio in the Cayo District (on the weekends).
On the Northern Cayes; Caye Caulker first, then Ambergris Caye. And if you want off the beaten path, then in Sarteneja — a beautiful fishing village in northern Belize.
Anywhere! Belize is magical. I would either pick one of the secluded cayes (islands), or go inland — by waterfalls deep in the Cockscomb Basin Wildlife Sanctuary, at Billy Barquedier National Park, or Rio Blanco National Park.
The “Split” on Caye Caulker.
The “deep south” or Punta Gorda, Belize.
It’s a national and cultural event, but I would say Garifuna Settlement Day and eve in Dangriga (November 18 and 19). It’s a blast and an unforgettable display of culture, with all-night drumming, concerts, and parades.
Belize is a big country, believe it or not, with six districts, plus offshore islands. There are tons of wonderful accommodations to suit all budgets. I’ll just mention a few favorites:
Moderate: Tipple Tree Beya in Hopkins, Spindrift on Ambergris, or Caye Caulker Plaza Hotel.
Budget: Lydia’s Guesthouse in Placencia, Dirty McNasties on Caye Caulker, Ruby’s on Ambergris Caye, or Tobacco Caye Lodge.
Paranda (for instance, music by Paul Nabor), followed closely by Punta Rock. If you’ve never heard of these, check out The music of Belize. 