Friends of V.I. National Park seminars run January through April. Call 779-4940 to make your reservation. Spend March 12 circumnavigating St. John aboard the Sadie Sea with Rafe Boulon, the park's chief of resource management, to learn about Coastal Ecology. The trip includes snorkeling stops. It runs from 9:30 a.m. to 3 p.m. Meet at the park Visitor's Center dock with your lunch, water, wading shoes, and snorkel gear. The fee runs $70 for non-members and $60 for members.