There are a lot of things to do in LA, depending on your interests! Some popular attractions include the Hollywood Walk of Fame, Universal Studios Hollywood, the Griffith Observatory, the Getty Center, and the Santa Monica Pier.
Definitely check out some of the iconic landmarks like the Hollywood Walk of Fame, the Chinese Theatre, and the Hollywood Sign. You could also visit some of the studios like Warner Bros or Universal Studios for some behind-the-scenes action.
For a 4-day trip, you could also consider visiting some of the city’s neighborhoods, such as Beverly Hills, West Hollywood, and Venice Beach. And of course, there are plenty of great restaurants, cafes, and shops to check out as well.
I would highly recommend visiting the Getty Center, which has beautiful gardens and an impressive collection of artwork. You could also check out the Griffith Observatory for some stunning views of the city and to learn more about astronomy.