When I made a motorbike trip in 2012 and wanted to visit Phu Hin Rong Khla National Park in the early morning I did find this small resort in Nakhon Tai. A lovely small resort with only 5 rooms just about 10 km from the entrance to Phu Hin Rong Khla National Park. Friendly staff and good restaurant serving Thai and western food for breakfast, lunch and dinner. They have free Wifi. But of course no swimming pool, but a nice garden and even space for camping if you have a tent with you. The rooms have airco, fridge and a small but good bathroom. And more important an comfortable bed.
Update Jan'2015 : I did stay here again and although I had a good night sleep and good food in their new restaurant you start to see tear & wear (due to lack of maintenance) in the room. A bit a pity.