Hello, Amy! Thanks for bringing your question to planDisney!
Four days at the Happiest Place on Earth sounds absolutely dreamy! You can purchase multi-day theme park tickets for up to five days. So, you can most certainly
purchase a four-day ticket to the Disneyland Resort. When you purchase your tickets, you'll have the option to select one park per day or Park Hopper tickets. Since Disneyland Park and Disney California Adventure Park are just a few steps away from each other, park hopping could not be easier. My family and I park hop nearly every day of every trip we take, so I absolutely recommend purchasing Park Hopper tickets.
When purchasing your tickets, you will be required to
make theme park reservations for each day of your visit. If you get Park Hopper tickets, you will make a reservation for the park you want to start at each day and then starting at 1:00 p.m., you can hop to the other park. You may want to check the
theme park reservation availability calendar to ensure the park you want to visit is available before finalizing any plans.
I hope this information was helpful. Have a wonderful time at the Disneyland Resort!
-Linda