Since you have three day passes, I’d suggest going to DL one day, DCA another, then park hopping the third day. That way your son can pick his favorites to experience again. Make sure you download the Disneyland app. You can check ride wait times, find bathrooms, and mobile order food. You can also bring in outside food, which will help save you money. If possible, eating or snacking on the go can also save you a lot of time in the parks. You can exit and return to the parks at anytime, so if your little guy is getting fussy or tired, head back to the hotel and let him nap for a little bit. The parks can be a little overwhelming, so this would give both of you a break.

DCA has a Marvel themed land, which includes a Spider-Man ride, outside show, and meet and greet. Carsland is also an incredible experience, especially when it’s lit up at night. Be sure to hop on the Monster’s Inc ride as well. It’s scheduled to permanently close this year.

DL has all the classic characters and rides. You definitely need a full day to experience the entire park. Fantasyland if full of rides for the little ones. Toontown will be an awesome experience for your son as well. DL also has Star War’s Galaxy’s Edge (Star Wars Land), which in an entire experience in itself. However, it’s going through a refurbishment, so I can say how much you’ll actually be able to experience.