I don't know about "must" do, but anything outside has a different atmosphere at night. I like Big Thunder Mountain, the view up in Astro Orbiters, and Jungle Cruise.
An absolute must do at night for us is BTMRR. Just a completely different ride at night.Are there any rides that are a must-do at night? Am considering a lazy morning before heading to the park around 3 pm, have a meal, go on a few rides and watch wishes.
Night time is my favorite time to ride the People Mover! I love the view looking down on Tomorrowland all lit up at night.Nobody has mentioned the People Mover!