Concerning snorkel equipment, we always drag our own along but it can be a hassle. On the flip side, you know that yours is not defective and that it's only been in your mouth. It's also cheaper in the long run. At Princess Cays, they charge $18 US per day for a mask, fins, snorkel, vest and mesh bag. $8 for just the vest. I also read that it is required to wear a vest on Princess Cays if you snorkel. Other snorkeling excursions include the snorkel gear and they don't give you a price break if you have your own.