The park is the southernmost of a group of four islands. The park is on the east side of Indian Arm of Burrard Inlet and consists of Racoon Island and Twin Islands which are about a kilometre apart. Twin Islands are joined by an isthmus that dries at low tide. Shoals extend from each of the islands. There are several small beaches on Twin Islands.
Adjacent waters are popular with scuba divers.
The park is primarily the destination of small boat operators. Small boat float, pit toilets and wilderness camping facilities on Twin Islands. No facilities on Racoon Island. Porteau Cove Nestled against the imposing ramparts of the Coast Mountains on the east shore of Howe Sound between Horsehoe Bay and Britannia Beach. Extensive beach area.