Ocean Force Adventures conducts tours of Biscayne Bay and Stiltsville on special Zodiac RIB Boats and covers more than 40 miles of waterway. This three-hour guided tour is tailor-made for a maximum of 6-person groups. You'll cruise by PortMiami, Downtown Miami, the Venetian Islands and the celebrity homes of Star Island and Fisher Island. All tours depart from the Miami Beach Marina on South Beach.