Although it's fun to go hiking with a Virgin Islands National Park guide, don't be afraid to head out on your own. To find a hike that suits your ability, stop by the park's visitor center in Cruz Bay and pick up the free trail guide; it details points of interest, trail lengths, and estimated hiking times, as well as any dangers you might encounter. Although the park staff recommends long pants to protect against thorns and insects, most people hike in shorts because it can get very hot. Wear sturdy shoes or hiking boots even if you're hiking to the beach. Don't forget to bring water and insect repellent.
The Virgin Islands National Park (1300 Cruz Bay Creek, St. John. 340/776-6201. www.nps.gov/viis) maintains more than 20 trails on the north and south shores and offers guided hikes along popular routes. A full-day trip to Reef Bay is a must; it's an easy hike through lush and dry forest, past the ruins of an old plantation, and to a sugar factory adjacent to the beach. It can be a bit arduous for young kids, however. Take the $6 safari bus from the park's visitor center to the trailhead, where you can meet a ranger who'll serve as your guide. The park provides a boat ride back to Cruz Bay for $15 to save you the walk back up the mountain. The schedule changes from season to season; call for times and reservations, which are essential.
Although you can set off by yourself on a hike through a rain forest or along a shore, a guide will point out what's important and tell you why. Ay-Ay Eco Hike & Tours Association (Box 2435, Kingshill, 00851. 340/772-4079), run by Ras Lumumba Corriette, takes hikers up hill and down dale in some of St. Croix's most remote places, including the rain forest and Mount Victory. Some hikes include stops at places like the Carl and Marie Lawaetz Museum and old ruins. The cost is $40 to $50 per person for a three- or four-hour hike. There's a three-person minimum. A jeep tour through the rain forest runs $120 per person.