Hey there, Paulina! Thanks for swinging by planDisney with your question. You must be super excited for your upcoming visit to the Happiest Place on Earth!
Paulina, to change starting parks, you would have to cancel your current
reservation and make a new one. As you’re now so close to your visit, I wouldn’t recommend canceling your current reservation, as
reservation availability can change in an instant, so it might be risky. With a
Park Hopper ticket, you can visit the other park starting at 1:00 p.m. and hop back and forth as much as you’d like the remainder of the day.
Starting at Disney California Adventure Park means you have a chance to rope drop at Avengers Campus or Cars Land and get into those attraction queues early! I would also strongly suggest adding
Disney Genie+ to your day if you haven’t already. This will give you access to 19
Lightning Lanes across the two parks, which are faster queues. Also, you can make a Lightning Lane selection for Disneyland Park while physically at Disney California Adventure Park, or vice versa, provided the selection is after 1:00 p.m. when unlimited park hopping is available. You can also purchase
Individual Lightning Lanes for attractions in the other park.
Adventure is out there, Paulina. Have a super time!
Kamini