Depends on the interests of everyone but here are some SF and LA things that spring to mind…
SF:
- Cable car and if mechanically inclined/interested, the cable car museum
- Chinatown - Z&Y is a popular choice. If you want dim sum on the go, Good Mong Kok Bakery is always busy. There’s a fortune cookie museum you can visit.
- Exploratorium is a science museum on the Embarcadero - super interactive
- Ferry building - food hall (lots to eat - check out Humphry Slocombe ice cream with unusual flavors) and sometimes farmer’s market (Saturday is best day) - if you are at the ferry building/along the Embarcadero, you can hop a fairly scenic street car to fisherman’s wharf; the street cars are regular public transit and 18 and under are currently free on normal transportation (not cable cars though)
- Alcatraz tour might be of interest - the ferry leaves kind of near fisherman’s wharf
- Fisherman’s wharf is kind of a touristy nightmare but can be fun in small doses and it gets into christmas
- Ghirardelli Square gets done up for the holidays and obviously the chocolate place/ice cream store is fun (but packed at times)
- Those little yellow cars someone mentioned are kind of a menace but honestly probably fun and you can do some very scenic drives along Crissy Field to the GG bridge and through the presidio
- The Presidio itself has very nice trails and views. Disney Family Museum could be nice if kids are artistic or into Disney. There’s an express bus that goes from the Financial District straight to the Presidio that’s currently free (search PresidiGo bus).
- Chinatown gets all the tourist attention but there’s a Japantown too - good ramen spots (Marufuku, Hinodeya), a Japanese bookstore, etc.
- My teens sometimes go to Haight-Ashbury and Amoeba records or thrift shopping, but it’s a little sketchy at times so be aware if you’re not used to that kind of thing
- The Mission is pretty big but has a high number of restaurants. A Mission/SF Burrito is a particular style without rice (popular places are El Farolito, La Taqueria), or you can get Tortas (Torta Gorda). Garden Creamery is v good ice cream. There’s a pirate store that might appeal to a whimsical teen (it is affiliated with a creative writing program founded by Dave Eggers; the space was zoned for retail so they added a store - 826 Valencia).
- Golden Gate Park has many hidden gems - notably a fly fishing pool area, a disc golf course, a pedal boat for rent area at Stow Lake, a bison paddock, some windmills and several cool museums. There’s usually some kind of Christmas light installation.
As others have said, do be careful not to leave ANYTHING in your car if you have one particularly if you are in tourist zones like the palace of fine arts or Lombard. Not even for 5 minutes.
LA:
- Definitely Universal Studios theme park - it’s perfect for teens, fun, easier than Disneyland plus you can do a movie tour
- Santa Monica beach/pier.
- They might want to stroll UCLA, get shirts or something at the Bruin store. Diddy Riese cookie ice cream sandwiches in Westwood are classic.
- The Griffith Observatory is very cool.
- Farmer’s Market food court at the Grove, though the Grove itself is just an outdoor mall.
- If you love magic and want a logistical challenge, look into how to get into the Magic Castle for brunch (watch the dress code)
- Alternatively, catch a comedy show at Largo
- Would probably skip Hollywood/star walk but might look at briefly if you say go to a taping of Jimmy Kimmel or something
- Malibu
- Sushi - lots of choices ranging from local favorites in strip malls around the city (esp the valley - this is super LA) to Matsuhisa in Beverly Hills, Nobu in Malibu (or La Cienega), Sugarfish in various locations
- Lots of teens like shopping on Melrose or for particular labels like Supreme etc…
- Beverly Hills driving around, maybe checking out Rodeo etc.
LA traffic is insane and the city is sprawling so be careful about your itineraries and when you’ll be driving from one area to the next if you don’t want to live the beginning traffic jam of LaLa Land without the singing.
Agree with not taking the 5 but the 101 from SF to LA. You can do the 1/PCH piece or skip it and just take the 101 all the way down. You can stop in San Luis Obispo for lunch or if you wait longer, perhaps Solvang (touristy Danish style town) or Santa Barbara.
Have fun!