Off of Ball Road signs will direct you once you turn they will have arrows for parking structure to the left for the park. And arrows to the right for downtown Disney, the Simba parking lot is the free parking area with validation. (3 or 5 hours)
There is parking just for Downtown Disney, you will see it marked as such when driving onto the Disney grounds. We used the one off of Disneyland Dr and Katella.
Once you go thru security, you bear to the right. So you don't need to enter Disney or California Adventure.
Thanks! Your answer is awaiting moderation.