The not-very-black "black sand beach" on Coloane is perhaps the only place in the SAR with a sense of space and emptiness. Despite Macau's miniature size, few tourists, it seems, make it this far south.
The natural black sand can be seen at the shoreline as the waves sweep away the artificial yellow sand, added by the Macau government in an attempt to prevent beach erosion.
Golden sands relentlessly losing to the waves... there is a probably an analogy in there somewhere about Macau's other, more popular tourist attractions.
'Wall diving' refers to swimming along an underwater cliff face. The cliff plunges down to unreachable depths and you admire the fauna as you glide along with a sensation of flying, as you can see here. (Moalboal, Cebu)
Hong Kong's dive sites are notoriously flat with sand or muddy bottoms. But in some special places, you can do 'wall diving' in Hong Kong, too! Hooray!
EXTRA, EXTRA: Land of no cheese has made it into the current issue Discovery, the Cathay Pacific inflight mag (Aug '13) with a couple of underwater photos (click to enlarge). Both 100% taken in Hong Kong! Really!
High Island and Plover Cove reservoirs, from about 500m in the air. The colour difference is in part due to the depth, apparently - High Island, though smaller in surface area, is the deeper of the two and has the greater volume of water.