The chocolate factory is relatively famous among tourists. I think it's also due to the scarcity of such shops available in Khao Yai, and most tourists are here to buy chocolates as gifts. There are seats available in the shop too. There is also a drink booth in the shop where you could order some drinks and chocolates to eat. I got a cup of hot chocolate and some dark chocolates to share. It's okay, but I have better ones. However, if you need to get some gifts for formality purpose, get their dark chocolate biscuit. Their dark chocolate biscuit is less sweet, and it goes well with coffee.
You are recommended to come to this place for a break, especially if you like chocolate. There is a restaurant next to the chocolate shop too. You can also dine there. I saw the reviews are pretty good too.