There are four dive shops on the island:
Frenchies Diving Services
Paradise Down Scuba
Belize Diving Services
Big Fish Dive Center
All have excellent reputations. You might want to make a choice based on which is available to start a class on the date you wish to start.
We have found that Belize Diving Services is more flexible with class starting dates.
Thanks and cheers,
Auxillou Beach Suites www.auxilloubeachsuites.com