On a nice day, the water taxi can be a pleasant 75-minute trip, but if it's rainy or really windy, then not so nice. The Caye Caulker Water Taxi boats (they go to San Pedro, too, despite the name) leave roughly every hour and a half during the day from the Marine Terminal near the swing bridge. US$14 one-way. Thunderbolt also makes the trip.
Flying overall is a better option. With 10 people, you may want to take a cab (US$20 for the cab) to the municipal airstrip. You'll save about half in air fares -- US$26 per person versus around US$47 from international. E ven with the cab fares, you'll save enough for quite a number of Belikins.
--Lan Sluder www.belizefirst.com