I always bring a snorkel with me on Caribbean trips. Spending hours on end floating in clear warm water, totally unencumbered by tanks or weights, slipping easily through the water, just a mask, snorkel, and fins, a small bright light for night snorkels, is as good as it gets. Thin nylon skins for sun protection when needed. More juvenile reef fish, seahorses and marine life in general than you will ever see on deeper reefs. I scuba dive most days when I'm in the tropics, but snorkel once or twice every day, usually dawn and dusk. Plain longer length vintage style snorkels are the way to go, no purge wanted. I've been doing this for decades, and if I had to give anything up snorkeling would be the last to go. I use frankinsnorkels, made from salvaged parts, to wind up with what works best. The long plastic tubes are decades old.