Eat cheese at the Cowgirl Creamery in Point Reyes Station. The earthquake trail at the Bear Valley visitor center. The lighthouse, and walk to chimney rock; it’s possible there will still be some gray whales headed north.
Thanks for the offer; sadly we won’t be getting down in that direction. Originally I’d hoped the Mrs. and I would do a pre-family reunion trip down to Monterrey and vicinity, but it didn’t work out. 
Stop in at Vladimir’s for a pilsner. Eat at your own risk, but have a beer or two. And finish with a shot of Becherovka.
Are you interested in microbreweries? Further up Highway 1 in Fort Bragg, there’s the North Coast Brewing Company and over in Santa Rosa, there’s the Russian River Brewing Company. Both have restaurants attached but I’m not sure if they presently have any tours.
Oh yeah, do this too. If you buy some to take back to eat wherever you are staying, practice restraint. Believe me, you think you can eat it all, but you can’t. Trust me, I tried. But it’s good stuff.
The Point Reyes Lighthouse is well worth a visit if you are there when it is open. Information on when it is open.
If you want to see the schoolhouse from The Birds, remember that it is in Bodega inland, not Bodega Bay which is on the coast. That is worth visiting also, and driving up the coast. Good birding.
If you can’t get to Cowgirl Creamery up there they have an outpost in the Ferry Building in the Embarcadero in San Francisco.
If you go to Fisherman’s Wharf, definitely visit the Musee Mechanique which is the most interesting thing there. Ride the cable cars, but also go to the Cable Car Museum which is where all the cables go - and which is free.
If you haven’t already come and gone, I highly recommend the Tomales Point trail - it’s long, but great, and I’ve seen Tule Elk every time I’ve hiked it. Also, Duxbury Reef is great tidepooling if you’re interested in that at all.
I haven’t had Becherovka since I was in Prague. True firewater, that.
Qadgop did you already go?
This. Highly recommended, if you like oysters. Best to call ahead and reserve, but you might be able to get in without calling. It’s a fun experience, right by the water in Marshall CA. Go to that location.
Also, a simple and quick, and nice, photo spot is the Cypress Trees Tunnel. It’s easy to miss and drive right past it, without knowing it is there.
Google Maps: Google Maps
Let us know how it goes. Enjoy!
We just got back; had a GREAT time! Stayed in the Eco-Refuge in Inverness, what a quirky, fascinating place! Spent waaaay too much money consuming LOTS of delicious oysters (not at Hog Island, sadly, but at many fine local establishments), broiled and raw,and other seafood. Had a great first day there with a ton of sunshine, which made the trip to Pt. Reyes lighthouse, and the beaches north of it, and Drakes beach to the east of it a real pleasure. On other days, where there was some fog, it was still clear enough to have great hikes on the Earthquake trail, along Limantour beach, other estuaries, and YES, we did the Tomales Point Trail (well, the first 2.5 miles of it) until we met the elk face to face, a good 18 of them, and that was great, as were the views along Tomales. Flowers in bloom everywhere, the boom of the sea, the rolling hills and distant land and seascapes.
We did cruise the cypress tunnel too! thanks for mentioning it; that made me check it out on Google street view, and ensured we didn’t miss it!
I also took the advice proffered here and we skipped the Muir Woods (we later learned that you needed reservations to even park there) and instead headed up to Armstrong State Forest Preserve, for the redwood experience there. Again, great hiking for the entire family, great mexican food later, and great soaks in the hot tub at the place we were staying that night.
The kids and their spouses (all 30-somethings) took a day to tour SF on their own, while the Mrs. and I enjoyed the quiet solitude of the Eco Refuge and the forests, but later we all enjoyed a tour of Alcatraz (meh, it’s just another prison, and nicer than a few I’ve worked in, but it was a beautiful day to cruise the bay and wander the island there) and a nice Dim Sum dinner.
Vladimir’s was a festival of meat, as we enjoyed rabbit, lamb, beef, ham, veal and strudel. Not being drinkers we didn’t try the Pilsners or other such potent potables, but liked the eastern european approach to food: Ferment everything!
Other faves: lots and lots of sourdough bread, trying more than a dozen different kambuchas, and trying some of the local cheeses. We didn’t get to the Cowgirl Creamery in Pt. Reyes Station, as they kept closing too early, but tried samples of their wares. Verdict: nice stuff, but for the family get-together, I’d brought an elder cheese from home, a Wisconsin Cheddar, 19 years old, that we savored on sourdough. After that, any other cheese will tend to be viewed through a different lense.
So: A great family vacation, in part thanks to the tips proffered here in this thread. I’d have loved to been able to take more of the suggestions, but maybe next time. But Pt. Reyes is a beautiful place!