My girlfriend and I have just returned from a fantastic 2 days at Phu Foi Lom National Park. You can stay in lodges in the park from anything from about 600 Baht a night up to 3,000 Baht a night but I suggest doing what we did, staying in some much nicer lodges about 5 kms before you get to the park. You can book these in the park too and they have nicer toilets, Cable TV, nicer beds and just generally better amenities....all for just 900 Bhat a night. The park itself was beautiful, great views, beautiful plants, the dinosaur exhibition in the forest, with life size dinosaurs, was excellent, got some great photos. The waterfall had no water, but then the rainy season did finish in August and this is 4 months later but we will be returning in the rainy season to see the same place again but with different plants, loads of water and just to see it in another season. The restaurant in the park does really good food too and the temperature, we were told would be about 9 degrees at night, cold for Thailand, but it was nowhere near that, in the day it was about 25 and at night about 15-20, lovely temperatures. It was a lovely romantic place to spend Christmas and we would recomend it to everyone. Couples, families and even for events.