WE TOUR Nelson's Dockyard and Shirley's Heights, finally we will be snorkeling for about an hour around a couple shipwrecks and looking for turtles, we normally always encounter them, but it depends on the visibility that day. I would say 85-90% of guests encounter turtles. Snorkeling is done in a protected harbor meaning the water is very calm and relatively shallow and visibility is normally good. Even beginners or first time snorkelers can do this. THIS IS NOT A BOAT TOUR! Admission to the national parks is 15$USD which gives you two tickets one for Nelson's Dockyard and one for Shirley's Heights. So to clarify you only pay one time for both parks! Tour Duration time is approximate, and depends on where you are staying and how far drive time is.