Here are some offbeat, hidden spots of LA Venice beach
LA river
Descanso gardens
Watts tower
Time travel mart
Phantasma Gloria
Santa Monica
Graumans theatre
Marine aquarium
Angels flight railway
Malibu Will share a tripoto link written by a traveller pertaining to their travel to offbeat spot of LA, see if it is suitable for your travel. https://www.tripoto.com/los-angeles/trips/los-angeles-for-the-off-beat-traveler-5af2e8254450f
Hello, there are a lot of unusual extraordinary to do things in LA, but as you said they all are very popular, and even maybe it makes them less unusual. But definitely, I can suggest you the Medieval Torture Museum. They are opening this summer in Los Angeles. Now they have 2 locations, and I was in Chicago location, it was really fantastic, this museum is entirely interactive and informative. As far as I know, you can reserve early bird tickets too. So, I am pretty sure you will like it.
Universal Studios Hollywood
Griffith Park and Griffith Observatory
Disneyland Resort Hollywood The Getty Center etc.
https://travellifo.com/10-top-rated-tourist-attractions-in-los-angeles/
LA is now known for its cultural diversity and as the creative center of the United States. California is well-known for its fantastic shopping, thriving culinary scene, numerous family attractions, and outstanding museums. Because of the mild to hot weather that prevails throughout the year, any visitor to this location should always pack a short and a t-shirt.