LA is not a very RV friendly city. Travel Village RV in Valencia or Castaic RV park, both in the Santa Clarita Valley right off the I-5. Malibu RV park is pricey and lovely. It is on the right side of the mountains for Los Angeles, wrong side of the highway for the beach, and also a long drive to Pasadena. Pomona KOA next to the LA Fairgrounds is a very nice park mentioned by others. All of these will be about an hour drive from the LA tourist attractions. LA itself is not really RV friendly and there are no lovely parks central to the city. There are a few parks in the San Fernando Valley (my neck of the woods) but I personally would not even briefly consider them because of location, most are cheap full time housing.