Visiting Hong Kong would normally mean shopping and Disneyland, but there's more to the island than unbridled capitalism. You may visit the Hong Kong Space Museum instead.
The museum, located in Shim Sha Tsui district in Kowloon, doesn't have displays as extensive as the one I visited in Shanghai, but there's a gem or two in the displays, including the ancient Chinese rockets, and the diorama depicting the Moon landing.
Entrance fee is HK$20.