The Point Reyes National Seashore is an excellent day trip. Only 35 miles north of San Francisco, there are so many different activities and sights—perfect for daytrippers of all types.
Head north from San Francisco for a great day of hiking, picnicking and sight seeing in Point Reyes. The winding drive through Marin County is so relaxing. Grab picnic items at Tomales Bay Foods before heading out to the Tule Elk Reserve. From summer through Fall, you can take a great hike up Tamalpais Ridge and see grazing families of Elk herds.
The view on the ridge is a great place to eat your picnic lunch, and by the time you get back down again, hitting up Inverness Market for some local, Tomales Bay-grown oysters. Pay for them and have them grilled right away, and then plop down on a nice spot on the nearby beach and enjoy your fresh seafood snack.
Make your way to the Point Reyes Lighthouse. Note: It is a little strenuous getting up and down the many stairs on the way down, but even in the blustery, fogginess it's still a great experience. You'll definitely build up an appetite, so head up to Fish. in the Sausalito dock/warehouse district for their amazing Dungeness Crab Rolls.