We just returned from Belize (specifically San Pedro on Ambergris Caye); a great vacation spot with beautiful blue water, sting rays, cute little sharks and plenty of colorful fish. With zip lining and Mayan temples to top it off!
The cuisine is mostly typical of a tropical locale, tasty but limited. But a few places did standout and would be worth a visit if you're ever down that way. The highlight for me was the Lobster Burrito at Warugamu; the place is a little hole in the wall, but with good authentic local cuisine. Everyone in town recommends it.
Another frequently recommended spot was Wild Mango, with a wide selection of ceviche. Try the Ecuadorian Ceviche, it's made with roasted tomatoes and is perfect.
Also note worthy in San Pedro are The Blue Water Grill for the finest dining experience, and The Mohito Bar with a range of fresh muddled naturally flavored mohitos.