Circumnavigate St. John on the Sadie Sea with Rafe Boulon, the V.I. Park's chief of resource management. The coastal ecology trip from 9:30 a.m. to 3 p.m. includes snorkeling, wading and floating in habitats. Meet at the park Visitors Center boat dock. Bring lunch, water, wading shoes, and snorkel gear. Fee is $60 for Friends members, $70 for nonmembers.