To be honest, when I went there I had no idea Khao Yai was in Nakhon Ratchasima. I always had the impression this province was much further away from Bangkok. Regardless of where it is, Khao Yai is well worth a visit. The Juldis Resort is a great place to be. You actually wake up cold there! It's green, fresh, and very, very relaxing. You'll come back a better person after taking on a few hikes. I really can't recommend it enough.