The fixed fare between the international airport and Belize City is US$25 (for the taxi, not per person). Thats the airport taxi association fare. Take anyone else and other fares apply, about 30-40 bze dollars for taxi to city.
Websites for the water taxi companies operating between Belize City & the cayes:
a) Caye Caulker Water Taxi Association:
b) San Pedro Belize Express:
c) San Pedro Water Jets Express: