You might be on the margin in terms of the dynamic stretch of common tranny emulsions, especially Velvia 50, which I wouldn't use for the task. Velvia 100, underexposed 0.3 so as not to create pasty shadows is a good stand-in, and especially good for afterglow. For a less saturated palette, Provia 100. Don't try handheld shots, but then don't lug along the biggest tripod you can find because space could really be at a premium.

The major problem in HK is finding your own contemplative space in a teeming, seething mass of humanity and the ever-present risk of being bumped, knocked, interrupted, chatted to, argued with, harranged... you name it, HK (and Kowloon especially!) has it.