St. George Village Botanical Garden occupies 16 acres in the island's center, laid out across the remains of a Danish-era sugar plantation workers' village that was abandoned after the 1878 labor rebellion. The garden specializes in native and naturalized Caribbean plants, with collections of tropical fruit trees, medicinal plants, and the dry forest species that once covered much of St. Croix before plantation agriculture cleared it. The ruins of the plantation village — cisterns, sugar boiling house, estate buildings — are woven into the garden paths.
It's one of the more genuinely interesting botanical gardens in the Caribbean because the historical layer is so present. You're walking through what was once an enslaved community's living space, now reclaimed by vegetation and tended by a small staff and volunteers. The orchid house is particularly good, and the cactus garden in the dry eastern section shows how much of St. Croix's original ecology differs from the lush tropical stereotype. Allow an hour, more if you have botanical interest.