About Outermost Adventures Water Taxi...Outermost Harbor Marine Water Taxi will take you to South Beach or North Monomoy Wildlife Refuge, both areas accessible only by water. South Beach is a spacious, truly unspoiled beach. Bring your coolers, chairs, beach toys, and fishing poles. The Wildlife Refuge provides resting, nesting, and feeding habitat for migratory birds, including more than 8,000 nesting pairs of common terns. The Water Taxis, operated by US Coast Guard licensed captains, are available every nice summer day from 8 am to 4:30 pm. No reservations are necessary.