National Khao Yai National Park: The park is a vast area. And a source of interest to you as well.Birdwatching at Sam Phraya Beach Sailing Rafting Khao Daeng Canal. Cave Phraya Nakhon Cave Tham Sai Kaew cruise Crimson Doi Tung. (Open to visitors every day from 08.30 - 17.00., Without admission fee).