Be careful, there is another temple of the same name in the province of Ubon Ratchathani ! This one is not a must visit in Nakhon Ratchasima province and so maybe don't take a long drive just to see this temple. But if you pass not far in a journey between Khao Yai and Nakhon Ratchasima city (also called Khorat), there, yes, go have a look !
Wat Pa Phuphachan is a temple and when you visit a temple in Thailand there are some rules to know and follow :