while visiting Jeju Island in South Korea, I noticed a pamphlet talking about some air and space museum. Initially I shrugged it off, because seriously, how good could it be on a Hawaii style island. But I was wrong, while it's not one of the best I've seen (and to be fair, I've likely seen the best ones in the world at this point), it was much better than average and definitely much better than what I expected. It was a very pleasant surprise.
One hall was a bit of recruitment for the local airforce, showing how they'd like their future air defenses to look like (although it was kind of shown as if it were their current capabilities):
The museum had a nice section explaining how flight works, and they had this nice demo of drag, showing how the middle widget rotated longer thanks to the pointy bits that reduce drag:
shooting balastic missiles with a bit laser from an AWACS like plane, nice but we're not quite there yet ;)
The top floor was about space and had multiple theater show, albeit all in Korean. The 5D 360 degree screen one was still fun to watch (but content was kid oriented):
Otherwise, while it wasn't a a huge collection of planes, they had a decent one, especially considering the location:
very short takeoff and landing plane