If you have a clear day and the fog hasn't quite yet settled in from the ocean, a great hike in the Point Reyes National Seashore is the Tomales Point Trail. Park at the Historic Pierce Point Ranch and then follow the out and back trail 4.7 miles to the very tip of the park. It's a level and soft path, with ample opportunities to see the birds and other wildlife that calls this rugged and windswept place home.
We'd started walking under entirely blue skies and then had the fog roll in on our return to the trailhead, creating an appropriate setting for the former ranch just before sunset.
This walk is a great one for families, since the trail is so easy to follow and the terrain relatively flat. Bring some layers in case the fog rolls in and the wind picks up and be on the lookout for the hundreds of Tule Elk that inhabit the grassland around you and are hidden just out of view.