36 CFR § 1002.23 - Recreation fees.
(a) Recreation fees shall be charged in the area administered by the Presidio Trust to the same extent that recreation fees have been established for the Golden Gate National Recreation Area in accordance with 36 CFR part 71.
(b) Entering designated entrance fee areas or using specialized sites, facilities, equipment or services, or participating in group activities, recreation events, or other specialized recreation uses for which recreation fees have been established without paying the required fees and possessing the applicable permits is prohibited. Violation of the terms and conditions of a permit issued in accordance with this section is prohibited and may result in the suspension or revocation of the permit.
(c) The Executive Director may, when in the public interest, prescribe periods during which the collection of recreation fees shall be suspended.