National parks or generally protected areas (PAs) normally hold a high value as a recreational resource or destination. Though in many cases no fee or charge is made to view or enjoy natural ecosystems, people still spend time and money to reach PAs. These costs of spending (for transport, food, accommodation, time, etc.) can be calculated, and a visitation rates can be compared to expenditures. These travel costs reveals the value that people place on recreational, tourism or leisure aspects of PAs
