A plan to manage roads and trails in the Marin County Open Space District—the first comprehensive effort since a ballot initiative created the district in 1972—has ignited a firestorm of criticism about limitations to recreational access, particularly in the San Geronimo Valley and around Bolinas Lagoon, where the highest restrictions are
proposed.

At a public hearing that stretched late into Tuesday night, dozens of local hikers, dog walkers, mountain bikers and equestrians assembled before the…