What is the best place/national park to see a variety of/guaranteed chance of seeing wild mammals in Thailand? After looking at Thai National Parks' website, I came across Khao Yai...who had more recorded mammal species than Kaeng Krachan and Kui Buri. Has anyone visited Thailand and these parks? Which one had a wider variety of mammal species and which one has a more guaranteed chance of seeing mammals?
Khao Yai has habituated sambar and macaques. Wildlife guides in the area can show you other species like elephants, gibbons, binturongs etc (do NOT use the nonsense night safaris - these are useless). Kaeng Krachan has more diverse species and more chance for truly rare ones like leopard or sun bear. Both places are very good.
A third site which is great is Khao Sok. Also good for various primate species, clouded leopard, tapir, sun bear, gaur et cetera.
Are there any National parks in Thailand which have more open areas/grasslands making wildlife spotting easier? I know Khao Yai has some grassland sections, but do any others?