There is another option. Congress should act on a bipartisan coalition of  US representatives' (including Derek Kilmer) proposal to address this issue. They introduced the National Park Service Legacy Act to the House as part of an effort to boost park maintenance funding for national parks.

The measure could provide up to $500 million annually through 2047 by allocating existing, unassigned revenues from oil/natural gas royalties that go to the federal Department of the Interior into a restoration fund. It wouldn't fund everything our parks need. The National Park Service currently faces an estimated $12 billion in backlogged repairs. But it's a start. More information on both the scope of the effort and a list of GOP and Democratic supporters is available on Derek Kilmer's website. U.S. senators Warner (D-Virginia) and Portman (R-Ohio) introduced an identical bill to the Senate. This is a bi-partisan effort which is refreshing during the current climate of hyper-partisanship.