Belize is the Caribbean's easiest adventure: English-speaking (it's the only Central American country where English is official), a 2-hour flight from Miami or Houston, and home to the second-largest barrier reef on earth — with the Great Blue Hole, Hol Chan's shark-ray alley, and some of the world's best snorkeling.
The country splits neatly in two: the cayes (Ambergris Caye and Caye Caulker — barefoot island life on the reef) and the mainland's Cayo district (jungle lodges, Maya ruins, and the extraordinary ATM cave). The classic trip does both: 3 nights jungle, 4 nights reef.
Belize is small (population 400,000) and uncrowded — the reef means the beaches are good rather than great (seagrass is normal), but the water clarity, the marine life, and the pace are the point.
Belize suits snorkelers and divers above all, plus honeymooners, families with older kids (the cave and ruins are real adventures), and anyone who wants the Caribbean without the crowds or a language barrier.