Explore the underwater world of saint john with a mask and snorkel rental snorkeling is one of the most popular and fascinating water activities on the island and gear can be rented by the day or by the week its perfect for beginners who want to get their bearings swimming in the shallow crystal clear waters of one of saint johns spectacular beaches yet its also suited for the more experienced adventurer who wants to discover reefs and all the diverse marine life that call this area hom