As a recreational diver who dives on vacations only, I would suggest doing the course and giving it a shot. People who first start snorkeling see a whole different world. Diving expands that world immensely. It is one thing to float 10 feet above a fish, and another to look it in the eye. If you are avid snorkelers, no doubt you have a good comfort factor in the water. That is a big plus. Those I have know that have done the resort course have a dive instructor close at hand all the time, watching you, evaluating you, and watching for the level of comfort you have. It is not all that complicated, and well worth the experience. It will also tell you whether you can handle it. Some I have known get extremely claustrophobic and a little panicky. Others have a problem clearing their ears. This is an opportunity to find out if it is something you would like to pursue. Just my 2 cents.

Been there, done that, the washing machine ate the T-shirt