Hi Soojung!
Thanks for visiting the Disney Parks Moms Panel with your question. I'm delighted that you will be traveling to the Happiest Place on Earth! Both Disneyland Park and Disney California Adventure Park have endless magical experiences from classic attractions to world-class entertainment.
On your visit, make sure to check the
Daily Events Schedule online or the
official Disneyland app for what events are happening each day of your visit. Currently there are nighttime spectaculars in each park. In Disneyland Park you can see Fantasmic! which is a show featuring many favorite Disney heroes and villains as well as familiar music and special effects. Also in Disneyland Park you can watch the mesmerizing fireworks spectacular "Remember...Dreams Come True." While you cannot see these fireworks from Disney California Adventure Park, you can usually catch a glimpse in the esplanade between the entrance of both parks.
In Disney California Adventure Park the nighttime spectacular
World of Color showcases one-of-a-kind fountains of water with projections, music, and pyrotechnics. This is my favorite nighttime spectacular at any Disney Park and a must-watch if you will be in the park. Make sure to pick up a FASTPASS early in the day to ensure a great viewing location for the show that night. The FASTPASS distribution for World of Color is located next to The Little Mermaid ~ Ariel's Undersea Adventure.
I hope this helps, and have a magical day!
-Jennifer