The park headquarters are located on Ko Wua Talab, which has basic bungalow accommodation.
camping
In case the cottages are full, you can rent a tent for 2 for 250 Baht. You can also bring your own tent and camp at the camping grounds. But you will almost always find a tent to rent.
lodging
The park has 5 bungalows which are of different sizes. The costs are quite low - 500 Baht per day - for a 2 bedroom cottage. The cottages are set in a beautiful backdrop and the park staff are very friendly, and fanatical about football. However please note that the park is not for the resort seeker. Facilities are basic - no hot water - and the park shuts off its electric supply at 11pm. So no electricity at night which only adds to the appeal of the place.
backcountry
Probably one of the best hikes in Thailand. In the National Park headquarters there is a path leading up the side of the rocks. This will take maybe 25-30 minutes to walk up, and well worth it. But be warned, this is not a hike for the faint hearted. Make sure you have good footwear as there are sharp limestone crags which will be your foothold, especially towards the peak. With a breathtaking view of all the Ang Thong islands, the end result of the hike is well worth it. Beware though, the hike is very steep in some sections and offer questionable ropes to hang on to. But this hike will justify the trip to Ang Thong alone.