Cal. Pub. Res. Code § 37023

The donee shall allow public access to the property to the extent that public access is consistent with the purposes for which the property is accepted. Before providing public access to the property, the donee shall develop a plan that minimizes the impact of public access on adjacent landowners in order to avoid infringement on the customary husbandry practices on adjacent or nearby agricultural or timber operations and that establishes a setback or buffer area, as necessary. This section does not require access to privately owned lands for which a conservation easement is contributed pursuant to this division unless the conservation easement provides for public access.