Lots of times you can book through the hotel itself and they throw the charges on to your room tab for excursions. As well, most operators take charge cards. The prices from most operators are the same so don't kill yourself looking for a deal. We have used different companies in the past and have had no complaints. San Pedro is small and news of bad operators travels fast so they end up putting themselves out of business. So as they say in Belize, don't worry Mon, it's no problem ! You'll be amazed at how that statment becomes while on vacation in Belize. Must do's are a ruin trip, cave tubing and a snorkel trip to shark ray and hol chan.
If you dive, head to the Atolls
Have a great trip