Benicia State Parks Association 290 E L St, Benicia, CA94510 Benicia State Parks Association is a nonprofit organization that works to protect state parks. It offers programs and…More works to help both the Benicia State Recreation Area and the Benicia Capitol State Historic Park. Capitol park has an entry fee for adults ($3) and children ($2). It holds events, including special meetings, book signings, art shows, bingo nights, workshops and more. It also offers volunteer opportunities.