Do you recomand me to be with car in LA?
Yes, you definitely NEED a rental car. Use WAZE to navigate and when it goes off the beaten path, enjoy the local streets. You may find something pretty interesting as there are many hidden gems. You can use other GPS, but imho, you'll do better with WAZE as your gps. If you are in some of the more populated areas, you may try to augment your adventure with Uber or Lyft or zipcar to also augment the short drives.. Hope this helps.
Yes, definitely. L.A.'s public transportation system is underdeveloped and inconvenient, and takes a lot of time to use. It's much better to have a car and a good GPS system, either from the rental company or on your phone.