On Ambergris Caye the post office in San Pedro is open weekdays 8-noon and 1-4. On Caye Caulker the post office is on Back Street on the south side of town. It's open 9-noon and 2-5 weekdays and 9-noon Saturday. There are no post offices on other islands. Your hotel or lodge can arrange to mail letters and postcards for you. FedEx has a service desk at the Tropic Air cargo office in San Pedro, and the Belize Postal Service offers an international express mail service.
Caye Caulker (Back St. 226/0325). San Pedro (Alijua Bldg., Barrier Reef Dr. 226/2250).