$30 pesos for the entrance fee per day. Paid $60 pesos total and camped for free. We parked right by the entrance next to the security guards who let us used their restrooms as all other restrooms are remain closed during the night. The place has a big parking lot but the security guards recommended we stayed close to them. Only stayed for the night on our way to Tuxla-Gutierrez. Did not use the public restrooms and didn't get in the pools.
Blog: Overland The Americas
Location: 16.53536, -95.20061