Art, gardens and beautiful views. Admission to the museum is free, but typically they require ticket reservations ahead of time which can be made on their website.
One of our favorite hikes in LA. Take the east trail (which is the easier one lol) for some iconic views of the Hollywood sign, then grab a coffee at SIghtglass afterwards.
For architecture or history buffs the Canals are really neat to see themselves, otherwise it's just a ten minute walk to the shops on Abbot Kinney Blvd where the vibes are more relaxed.
It's also worth a brief detour toward the Venice Boardwalk to check out Muscle Beach. :)