Cal. Pub. Resources Code § 5541
A district may plan, adopt, lay out, plant, develop, and otherwise improve, extend, control, operate, and maintain a system of public parks, playgrounds, golf courses, beaches, trails, natural areas, ecological and open space preserves, parkways, scenic drives, boulevards, and other facilities for public recreation, for the use and enjoyment of all the inhabitants of the district, and it may select, designate, and acquire land, or rights in land, within or without the district, to be used and appropriated for such purposes. It may cause such trails, parkways, scenic drives, and boulevards to be opened, altered, widened, extended, graded or regraded, paved or repaved, planted or replanted, repaired, and otherwise improved, may conduct programs and classes in outdoor science education and conservation education, and may do all other things necessary or convenient to carry out the purposes of this article.
The board of directors of a district shall not interfere with control of any of the foregoing or other public property, that are existing, owned or controlled by a municipality or county in the district, except with the consent of the governing body of the municipality, or of the county if the same is in unincorporated territory, and upon such terms as may be mutually agreed upon between the board of directors of the district and the governing body.
Ca. Pub. Res. Code § 5541