I LIVE in Los Angeles now. As was correctly pointed out, it is a huge, sprawling city. No central area whatsoever. Downtown LA is enjoying a renaissance and is right next to Chinatown, Hollywood is a ways away but HW is right next to Beverly Hills, and to be honest, unless you wanted to come here to enjoy some of the terrific museums, spend a day walking around Hollywood, and then a day at the beaches checking out either Santa Monica or Venice, I would say skip it.
I live here now also (in a suburb).
Everything the other posters have reported is true. If this is your first time coming to L.A., there are many things you MUST include on your "to do" list.
You'll do well to follow the suggestions of the other posters. If you don't plan on ever coming back, then of course you'll have to visit our "world famous" tourist attractions, like the Hollywood walk of fame and Sid Grauman's Chinese Theater (hand & footprints of yesteryear's movie stars in the cement of the courtyard of the theater), the Rose Parade on new year's day, Disneyland, Universal studios, and perhaps Catalina Island, just to say you saw it.
If you want to impress your wife or girl friend, take her shopping along Rodeo Drive in Beverly Hills.
The three places most tourists want to go when they visit are Disneyland, Universal Studios, and the Hollywood walk of fame/Grauman's Chinese Theater. You can also go to a local sporting event depending on who's in season (baseball, basketball, football, Hockey, etc) We've got 'em all out here, college & pro.
If you really want to see something you've never seen before.........anywhere,
go to the Hollywood strip on Halloween. You'll see things (people) that evening you'll never ever forget!!
Bring your camera, because people will not believe you when you tell them what you saw. Renting a car can be expensive. You can go anywhere in the south land you want using
Lyft or
Uber, (much cheaper than a cab) and you don't have to be concerned about parking (which can also be expensive). They'll drop you at the door or entrance. They can take you to the airport, but they can not pick you up at the airport.
If you do come in, fly into any airport other that LAX, it's a zoo 24-7, especially during the holiday season. Avoid it if you can. There are 3 other local airports you can utilize: Ontario (35 miles east of L.A.), John Wayne (to the south in Orange County) & Burbank (to the north of LAX in the San Fernando Valley area). One other thing...................
bring lots of money.
It costs
BIG $$$ to see the sights, reside in our finer hotels and dine in our finer restaurants. This is not the place to come if you're on a tight budget, or a tightwad, especially if there are lots (4-6) of other people in your party. Enjoy your stay.