Piedras Blancas Historic Light Station Outstanding Natural Area Act of 2004 - Establishes the Piedras Blancas Historic Light Station Outstanding Natural Area (Outstanding Natural Area) in San Luis Obispo County, California. Directs the Secretary of the Interior to manage the Outstanding Natural Area as part of the National Landscape Conservation System and to complete a comprehensive management plan to provide long-term management guidance for the public lands within the Outstanding Natural Area.
Authorizes the Secretary to enter into cooperative agreements with Federal, State, and local agencies to implement the management plan in the Outstanding Natural Area and to continue partnerships with local communities and the Hearst San Simeon State Historical Monument. Provides for the acquisition of State and privately held lands adjacent to the Outstanding Natural Area as additions to the Outstanding Natural Area.
Prohibits restrictions on overflights and law enforcement activities in the Outstanding Natural Area.
Directs the Secretary to ensure access to the Outstanding Natural Area by Indians and Indian tribes for cultural and religious purposes.