The provision of national parks is what type of government expense

In a way, every American who pays federal income taxes contributes to the national parks budget. That's because the federal government foots the bill for the National Park Service.

The national park budget is separated into two categories: discretionary and mandatory funds. Each year, the NPS submits a budget proposal that gets wrapped into the budget for the Department of the Interior and the Executive Branch as a whole. That proposed budget then goes to Congress for review.

Another important source of funding for national parks is the federal Land and Water Conservation Fund.