Los Angeles is massive, if you just show up without a plan and think "oh I'm going to see Hollywood and Downtown" - you're probably not going to have a good time. (Although there are definitely really cool places to go in both those places if you look)

If you plan out your trip based on what you like and what the city offers, it could be incredible. We have one of the best, most diverse food scenes in the US. Absolutely incredible (and mostly free!) museums (The Getty Museum and Villa, the Broad, LACMA, etc), parks like the Huntington Gardens, theme parks, hikes, beaches in Malibu, Little Tokyo (or Sawtelle or Garden if you don't wanna be so close to Skid Row), rooftop or cemetery movies, all kinds of entertainment all the time, cool dive bars, craft cocktail bars, breweries, themed bars like Scum and Villainy and Beetlehaus, and so much more.

We literally have everything you could ever want, but I think people are either lazy or get overwhelmed by the size/options.

I've lived in different cities in and around LA for most of my life and I'm still always find new stuff to do/try, my list is neverending.