It’s hard to find a good Map of The Virgin Islands, and the same goes with charts, etc. Well I stumbled upon a really cool website that has tons of great maps. They aren’t hiking maps for st John, but they are really cool so you can get the layout of the area. This is the website: http://moon.com/maps/caribbean/virgin-islands/ and they are sponsored by Avalon Travel.
This one of St John is especially good, very detailed! Check them out before your next trip to St John.