There is nothing worse than a bad mask or better than a good fit..... I suggest you buying your own mask a good one costs about $75 I also suggest getting a pair of wet suit gloves to avoid coral cuts and stings. And if you are really into it a wet-suit 1/8" T shirt protects you ftom sun-burn and gives added flotation... and is better than a vest to swim in...... cost is about $50 at your local dive shop. I base this on 20 years of south Pacific snorkeling and diving. Considering the costs and distances you travel to get there an investment in this area will take a good experience to a great experience......