With one day in LA you will prolly have to pick an area and do activities/lunch/dinner there, I got a few spots from my last visit
Malibu: point dune (beautiful views of Malibu, easy trail), Malibu farm restaurant/geoffery (lunch with amazing views), Malibu county mart (shopping/walk around). Malibu is complete beach/surfer vibes. The drive on pacific coast highway is beautiful
West Hollywood/Beverly Hills: matcha or coffee at La La land or community goods. I get the banana matcha from La La land, rodeo drive (designer strip/solid food places), melrose (cool stores) the comedy store (best stand up acts come here, recommend getting tickets early - evening activity), can hotel hop along the strip at night, most hotels have a club area (One Hotel, the edition, some others I’m forgetting)
Santa Monica: Montana avenue (can get a coffee, check out some cool shops, get good lunch), bergamont arts station (cool industrial buildings with a bunch of art exhibitions). If you check out the pier it’s pretty crowded so heads up there
Venice beach: Abbott Kinney (great shops, good food spots around)
That’s just a quick list I could think of there is still so much of LA I gotta see still
Baby be mine criminally underrated. Also thanks