We stayed here for three nights, while exploring the Khao Yai National Park. We were originally given a room in the new building (called the "Tree House"), but the noise from the main highway was loud, detracting from the ambience, and the room's decor felt very "plastic-like". For an extra $10/night we switched to a room away from the main highway, and it had a nice rustic feel - definitely worth the extra cost. The hotel has some very nice elevated walk-ways, from which you can bird-watch or simply enjoy the views of the area. The included breakfast is mediocre at best - instant coffee, slices of "Wonder bread" that you can toast and slather with some dreadful margarine and overly sweet marmalade, and eggs that come undercooked. You can ask for "Thai breakfast", which replaces the eggs and consists of a reasonably good but small bowl of noodle soup. The wait-staff in the dining area seemed perpetually miffed that they had customers. It was hard to get their attention away from their ipods/cell phones long enough to listen to your order. We tried having dinner at the restaurant one night and were not impressed with the food quality. There are other dining options along the main highway (some of which you can walk to). If you're adventurous, try some of the small restaurants that the locals use. We had our very best meal in Thailand at one of them.
A few things you must be aware of when you go to this area: (1) the tourism is increasing by leaps and bounds and you see construction as well as a lot of big billboards advertising newly constructed condos (i.e. this is a not exactly a remote location) & (2) virtually all the hotels in the area are miles away from the park entrance (i.e. you need to hire a car to get you there).
We had an excellent, very knowledgable guide while in the park, who went way beyond the call of duty (my teenage daughter was having an ear ache so she brought us into Pak Chong and took us to a clinic, translated for us, stayed with us for an extra two hours, etc). The guide service, which is run by herself and her husband) is "Wildlife Safari and Jay Jungle Tours (Jayjungletrek@gmail.com).