Caribbean Trail.... yup, it's underwater. Buck Island, St. Croix, US Virgin Islands.

Buck Island Reef National Monument Snorkeling Trail. Yes, there's a snorkeling trail! So I think it counts for this channel. Short video of some sights on Buck Island, a great, quick, well-worth it, amazing little destination just off of St. Croix. Beautiful place and a great day trip. Really special place.