The Getty is pretty spectacular. The museum is free but parking is about $20. You park at the base and take a trolley to the top of the hill and the museum buildings. I think there are four or five buildings with a wide range of amazing art, furniture, sculpture, printed material, etc. the landscaped gardens and views are beautiful. There are tours of the gardens.
Someone said earlier that parking for the Griffith Observatory is crazy and I agree, although I braved the road to the top and found a spot easily. There seemed to be high turnover. It’s cool to see the Hollywood sign, but I didn’t think there was a lot to do within the observatory. 90 minutes was adequate unless you have a significant interest in astronomy.
If you go to Rodeo Dr. note that there are many other stores on the next block over (is it Beverly?) that are more mainstream (unless you can afford the bling on Rodeo) $-) there’s a good NY style deli in that area. Good for people watching, though I didn’t see any celebrities.
If you like classical music check the schedule for the Disney concert Hall not far from the staples center.
I’ve only been on the Warner brothers studio tour, but my brother (who lives in LA) says it’s the best one.
The Grove is nice for shopping and dining. If you park in the garage take the elevator to the top floor for a surprisingly good panoramic view.
Have fun and let us know where you went!! They’ve been getting a fair amount of rain lately- they don’t know how to drive in it though!!