To amend the Internal Revenue Code of 1986 to allow individuals to designate any portion of their income tax overpayments, and to make other contributions, for the benefit of units of the National Park System.

Amends the Internal Revenue Code to allow an individual to designate a specified portion (but not less than $1) of any income tax overpayment and any cash contributions to be used for the benefit of units of the National Park System. Establishes a National Parks Trust Fund into which appropriated or credited amounts are received. Authorizes the Secretary of the Treasury to pay, not less often...