The BD family contains avid snorkelers, but only Mrs. BD is a skilled scuba diver. But even snorkeling, she can swim down 20 feet easily to inspect something. Loves it.
But about the peas. On good advice we bought a big bag of frozen peas at the Cabo WalMart, filled a plastic water bottle with them and then added water to the bottle. When you are diving or snorkeling near rocks or a reef, just squirt a few peas out of that bottle. You will be swarmed with tropical fish. Works like a dream. Like tossing bread to pigeons in a park. Fish were crashing into me, some over a foot long, and one bit Mrs. BD while trying to get to the pea bottle. Very cool thing to try. Wish I had had an underwater camera.
We had to go on a goofy party boat to get to a good snorkeling area, and they provided the equipment. Unlimited free drinks. It was jolly. On the way back, Mrs. BD danced the Macarena and YMCA without touching a drop of drink (not a photo of her). I didn't, and I did.