It's Culebrita in the Spanish Virgin Islands (formerly known as the Passage Islands) and is part of Puerto Rico. It's only a 2.5 hour downwind sail from Charlotte Amalie, St Thomas. If you avoid the weekends when the local boaters show up (and even then it tends to be very family friendly with multiple generations onboard the boats), you will usually have the island pretty much to yourself. The main anchorage is Bahia de Tortuga (Turtle Bay) - you can expect to count a dozen or more sea turtles rising near you boat. We've experienced some amazing full moons here. Only challenge is that this bay is exposed to northerly ground swells.
From Bahia de Tortuga, it's a relatively easy 20 minute hike to the lighthouse that was built by the Spanish from 1882-1886. It was destroyed in 1932 by a hurricane, rebuilt, then extinguished during much of WWII for security measures, returned to service in 1944, automated in 1948, then the building was finally closed in 1959. There has been some attempt to stabilize the crumbling lighthouse walls, but be cautious if you explore the rooms. The spiral iron staircase looks ready to collapse. I haven't tried to climb up the steps since Hurricane Irma.
The nearby populated island of Culebra has several very good restaurants in the small town of Dewey. There is a Spanish Puerto Rican vibe to the island that is completely different from the nearby USVI and BVI. I've found the residents to be extremely friendly.
