To assist in the establishment of an interpretive center and museum in the vicinity of the Diamond Valley Lake in southern California to ensure the protection and interpretation of the paleontology discoveries made at the lake and to develop a trail system for the lake for use by pedestrians and nonmotorized vehicles.

[AI summary unavailable — showing source text] Directs the Secretary of the Interior to: (1) enter into an agreement with an appropriate entity to share the costs to design, construct, and operate an interpretive center and museum on lands under the jurisdiction of the Metropolitan Water District of Southern California to preserve, display, and interpret the paleontology discoveries made at and in the vicinity of the Diamond Valley Lake, near Hemet, California, and to promote other historical and cultural resources of such area; and (2) enter into an agreement with the State of California, a political subdivision thereof, or a combination of State and local public agencies for sharing costs to design, construct, and maintain a system of trails around the Lake for use by pedestrians and non-motorized vehicles.…