The starting line for the Arcata Community Forest Run is Redwood Park which can be reached by going to the end of 12th Street in Arcata and drive to the end of Redwood Park Road. There is limited parking, to please carpool. For more information, see the SRRC Calendar at 6rrc.com.
I found a nice flat trail as a sample of this run, but you won't find many in this race. It is a beautiful, but challenging run.