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You've been missing out! Carowinds has a different atmosphere at night. For one, it's much cooler of course. County Fair usually looks really nice, with lots of light displays on the games. Screamweaver looks wild with the "taillights" on the cars being very visible and creating a neat effect, although it'd look even better with the light package that SFOG's Wheelie has. Ricochet looks nice at night.
Many of the rides are also better at night, especially the woodies and Top Gun. Wooden coasters tend to pick up speed after heating up all day and cooling at night, and extra speed is a good thing. Hurler is often really good in the front seat at night, as the extra speed adds to the airtime. Thunder Road is fun with the tracer lights going up the lift. I just wish they'd turn the tunnel lights off - those tunnels were nice when they were pitch black, but are lit up REAL bright nowadays.
Top Gun sometimes kicks into another gear at night after a hot day. Oddly my best rides on it are at night during Scarowinds, when it's not hot during the day and it's cool or cold at night. Still, it often runs a bit faster on summer nights than during the day, which makes a good ride even better. And you get some great views of lit-up County Fair. BORG seems to ride about the same at night, but has great views as well.
The one coaster that I used to love at night was Cyclone. It didn't seem to run any different, but the helix used to be enclosed and it got totally dark in there at night. Due to a bat problem they had to remove the roof, so that's lost a bit of it's nighttime charm.
Ride the Skytower for some great views of the city, including the skyline in the distance. And if hasn't cooled down too much, Rip Roarin' Rapids is an interesting night ride. It's much different going through there in near darkness, although it sucks if you get too wet with no sun to dry you off.
KenB