Overflow parking is available in the gravel lot by turning left after the guard shack. The park charges for parking at the Nature Center but you can park for free at the library/tennis parking lot on Studebaker just south of Spring street and walk down Spring street to the Nature Center (one mile walk). The address for the library is 2900 Studebaker Road, Long Beach, CA 90815.
The center asks that we not block the trail by staying to the right so others can get by. You can find more of their directions, hours, parking info and rules here, http://www.longbeach.gov/naturecenter/general_information.asp.