The TTA ride is cool to ride at night due to all of the neon lights throughout TomorrowLand. Riding Pirates of the Caribbean is cool at night as well. And you cant leave out Haunted Mansion either.
Any of the outdoor rides are different experiences at night. I would never recommend Astro Orbiter unless you like a long wait in a boring queue and bruised ribs. If you can get past that the views are great. I don't see what would be different about riding Pirates at night.
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