Rainbow County Park 
5157 5th St.
Rainbow, CA 92028
760-728-2303
http://www.co.san-diego.ca.us/parks/picnic/rainbow.html
Park: Picnic, Walk
Rainbow Park provides active recreation elements such as ballfields and tennis and basketball courts. It also has picnic amenities where one can enjoy a picnic lunch or host a family gathering. Reservations are required for organized sports and large picnic groups.