Take the wooden bus to the fairly new and surprisingly modern visitors centre. Walk the boardwalks through the mangrove forests and over creeks. Ask at centre for other walks available. The actual national park area part of the Chumphon Archipelago in Chumphon Province is huge and takes in islands, reefs, beaches, jungle, mountain, creeks, ocean, and mangroves. You can stay overnight here. There's a camping area, and bungalows on the Pong Pang Viewpoint go for 600 baht per night, and accommodate 2 people. Add 100 baht for each extra person. Dorm beds, with no bedding for 50 baht. There are also two restaurants. A good place to visit to make the best of your stay in Chumphon.