The island of Saint John has rich human and natural history. There are Taino archaeological sites and ruins of sugar plantations from Columbus's time. Past the pristine beaches are mangroves, seagrass beds, coral reefs and algal plains.
Cool rum still ruins and Taino Indian petroglyphs are a must see. Easy downhill 2.4 mile trek but after all that seafood and rum in Cruz Bay the night before, you get to work it off coming from sea level on Reef Bay back up to the parking area on Highway 10.
Moderate is a good difficulty ranking, with only some steeper sections with switchbacks and rocky. Fantastic panoramic view at Rams Head Peak, southernmost in St John, can see St Croix in the distance. Open to weather, so be prepared for blazing sun or higher winds if stormy.
I did this trail hike/walk a little over a year ago, and I still have nostalgia for it on a regular. Super easy trail that leads to a paradise!! I wore flip flops to get there and it didn't even phase me, or my feet. Make sure you take a towel and your snorkeling gear, and plan to stay on that beach at least an hour or two! So you might wanna pack a light snack, too. So beautiful!! Can't wait to visit here again someday.