I’ve done the trip twice, once from LA to San Francisco and more recently (last summer) San Francisco to LA with DD’s who were 10 & 13 at the time.
In San Francisco I highly recommend going to the farmers market which is at the ferry terminal a couple of times a week. I’ve never seen anything like it, the most amazing fresh produce piled high on the stalls and lots of delicious food to buy and eat while you’re walking around.
Did Alcatraz on my first visit and it’s worth it if you’ve got the time to spare.
We went to a baseball game and it was great fun, stadium is right on the water so brilliant views too.
Highly recommend www.bigsurriverinn.com/, they do a great brunch type menu and they have great wooden seats built in the river where you can sit and dangle your feet in the water.
Santa Cruz - stopped for an afternoon, we weren’t that impressed, felt like Blackpool in the sun.
Pismo Beach - brilliant overnight stop spot. We didn’t explore the town itself as got there late afternoon and left the following morning but it was long enough to walk down the paths from the cliffs to the beach, swim in the hotel pool and then sit round a fire pit at the hotel at night overlooking the ocean - one of my favourite California experiences. If you stay there book a hotel on the ocean front.
San Luis Opisbo - just inland from Pismo beach and where I stayed first time I did the trip. Great little American town and if you stay on a Tuesday it’s BBQ night when they have the most amazing night market along the Main Street selling food. It’s possible to stay in Pismo Beach but drive into San Luis Opisbo for the day/evening.
Pacific Grove - very pretty town between Monterey and Carmel (they run into one another) which I stayed in both times and highly recommend. Cheaper than staying in Monterey and nicer accommodation imo. It feels like an American town from the movies with a wide Main Street lined with beautiful painted wooden houses and you’ve got easy access into the other two towns.
In LA my favourite place is Santa Monica (which I think some say isn’t actually LA) as its on the coast and has great restaurants, shops etc but easy access to LA itself. We got ubers whenever we wanted to go into the city but apparently the train service from Santa Monica is really good. Venice Beach also great for restaurants on the Abbot Kinney Blvd (it’s all “very LA hipster” but still lovely).
Been to a few of the studio tours in LAand recommend the Warner Brothers tour out of all of them. It’s worth looking up in advance if there are any shows filming while you‘re there and applying for free audience tickets, we just missed a filming of Fuller House which DD2 was gutted about!
Go and see a film at Mann’s Chinese Theatre (cinema in Hollywood Blvd where all the hand prints in the cement are).
I know that you can buy day tickets to Disney as they have the prices published at the gates into the parks but I don’t know if you can buy them for one day only online. We bought tickets for 5 days as it was barely more than the 3 day ticket and as we stayed in Anaheim for 4 nights we went everyday but not full days. I think they price the tickets so that it’s always worth buying for more than 1 day and as there are two parks in California (both worth visiting) probably better to get one of their online deals in advance. I’m sure Disney will have worked out that if they price it so that you buy a ticket for multiple days that you’re more likely to come for more than one day and therefore spend more on food etc once you’re there!
I absolutely love California and want to go back again soon but one thing I say to people is to be aware of the number of homeless people there are. On my first trip many years ago it was evident in San Francisco (and still seems to be worse there in terms of the number of homeless people you see) but second time around even the smaller, more manicured towns such as Santa Barbara have homeless people walking down the street pushing their belongings in trollies without any shoes on. The reason I mention it is that many of them have mental health problems (if you look into the reasons for the homeless problem in California you’ll find that one of the main reasons are mental health and substance abuse) and they can be quite vocal, shouting at passers by and in San Francisco particularly often gather in quite large groups. I never felt unsafe but my DD’s found it quite intimidating and it put them on edge a bit. San Francisco is also very different to everywhere else you’re going. I think it’s a fantastic city but while it has many pretty streets and picture perfect areas it is quite a busy, dirty city in places - it has the pace of NYC but without the polish if that makes sense. The first time I went it was a bit of a shock after the comparatively clean and manicured places I’d been further down the coast but I loved it second time around once I knew what to expect.