As a kid I went to the Titusville Airshow in Florida (amazing if you like modern and warbird aircraft). Anyways, there were two highlights for me, one was they had a couple A-10's making passes on fake tanks showing their attack runs (when they work in pairs, the tanks get 9 seconds of respite between passes), and had their GAU8A Avenger cannons loaded with blanks firing. I'll never forget that sound.
Other coolest part was getting to fly in a Huey Cobra. And watching a harrier was pretty neat. And this was right after they declassified the stealth Bomber and let one fly over. And... well if you like planes, go to that.