MCL gave strong support to the effort to establish the Point Reyes National Seashore and worked with Peter Behr, who had formed a group called Save Our Seashore, to accomplish this. MCL continues to influence its planning through its Parks Committee.

MCL continues to work on preserving important natural features of Marin. Projects have included the San Rafael Shoreline, Corte Madera marshes, Bahia, Rush Creek in Novato, Bel Marin Keys and other creeks, wetlands and ridges.