In reply to Elle Bells:
https://hongkongclimbing.com/ has much of the information you'll need.
Plenty of granite bouldering, but for much of that you would want a pad. Ideally, bring a harness + rope and try to hook up with some locals and head to Tung Lung island for a memorable day out or multipitch it up Lion Rock (Kowloon) -- something I've wanted to do but still not managed in all the years I've been going!
https://hongkongclimbing.com/forum/ for getting partners.
Most places are easy to get to with some MTR and taxi, and a local to get you to the crag. There is some sharp vegetation about and possibly need to hack it if going to some lesser used bouldering spots. The main climbing areas should have easy access (other than the need for a ferry or MTR/taxi).
Post edited at 11:22