Coastal and Caves Adventure. A 2-hour catamaran tour along the coast and caves from Marina de Portimão, our lowest-priced shared trip. Every operator on the Circle is booked direct. No commission, no middleman, no booking fee stacked on top: you deal directly with the people who run it. Reserva direta com quem opera, sem comissões e sem intermediários. #algarve #algarvecircle #portugal #thingstodoalgarve #boattrips