Sea-canoeing is a popular activity in the park. It is a form of eco-tourism that is available in several variations, as popular one-day tours, or more extended tours involving overnight camping on island beaches. You will see more of the area, as many mangrove swamps and island grottoes are only accessible by canoe.
One company that offers sea-canoeing tours is Sea Tour. Their boat leaves from the North East of Phuket island (Ao Por) at 6am.