Hi, Andrew!
Welcome to planDisney! Multi-day visits are the
best way to enjoy the
Disneyland Resort, so let's get to your
ticket specifics.
Based on the plans you described, you have two options: You can either buy a 4-day Park Hopper ticket or buy a 3-day One Park Per Day ticket and use it after or before a single 1-day Park Hopper ticket.
But I think I have good news for you: I made a simple simulation while writing this answer and a 4-day Park Hopper looks cheaper than a 3-day One Park Per Day ticket
plus a single 1-day Park Hopper. So, if I were you, I'd purchase a 4-day Park Hopper and have lots of fun going back and forth between Disneyland Park and
Disney California Adventure Park! How does that sound?
After buying your tickets online, don't forget to make your
theme park reservations and download the
Disneyland Mobile App so that you can start making
dining reservations at your chosen theme park!
I hope you have a great time at the Disneyland Resort next month, Andrew! If you have more questions before February, let us know. We'll be here!
May the magic be with you,
Julie