The ding ding transport is ideal for observing the buzzing streets with enough time to take photos as it goes quite slowly. It's also cheap (2,3HKD no matter the distance). But if you hurry go for MTR
Crosstown tram much slower than crosstown MTR Island, but great view on top of double-decker tram and only HKD $2.30 (USD $0.30) for 45-min trip across Hong Kong