Plans to upgrade visitor access and facilities for Marconi Cove in Marshall were put on hold indefinitely earlier this month, after the California Coastal Commission changed the terms for a $266,000 mitigation fee that it awarded in 2011 to Caltrans, to then give to the state parks department. That money, instead of funding the Marconi project, will go toward the conversion of an existing structure at Mount Tamalpais’s Steep Ravine into a low-cost cabin lodging.…