I got certified while i was there in may with Reef Adventures. My dive master was Ched. He was very knowledgable and patient. We did all the classroom instruction in the water, much more interesting than doing it at home in a classroom. He went over the hand signals for about 1/2 hour, until we were comfortable, then we decended into 10 ft deep water to practice proper breething techniques and as soon as were were ready we were able to do our first 30 ft dive. I would highly recommend to anyone getting there certification to do the whole thing while in belize. You can read each chapter on your own back at your hotel and answer the questions at the end of the chapter and then you quickly go over them the next day before getting into the water again.