If you are visiting Disneyland on multiple days, I highly recommend purchasing Park Hopper tickets. Park Hopper tickets allow guests to go to multiple parks in one day. The regular entrance ticket only allows you to enter 1 park per day. The Park Hopper tickets allow you greater flexibility during your visit. If one park is really packed and the lines are long, you can open up the Disneyland mobile app to see if the other park has shorter lines. I use this hack often, especially at Disneyland Park. Disneyland Park is the busiest park, and thus has the longest lines. If you run out of FASTPASSes and can’t stand to wait in long lines, check out the other park to find better ride options. Disneyland Park and Disney California Adventure are right next to each other, as in a 2-minute walk across from each other. It’s super easy to get from one park to the other.