EPCOT - RD any of the 3 major rides (Soarin’, Frozen, or Test Track)
HS - Toy Story Midway or Rock n Roller Coaster
PM EMH are harder because it seems that people find it easier to stay later than to get up early.
I would recommend rides that have a different “feel” at night. Big Thunder, Astro Orbiter, 7 Dwarfs Mine Train (basically anything with an outside element) are going to be a different experience at nighttime. I HIGHLY recommend Astro Orbiter during the fireworks (if you aren’t watching them directly).