Looks to be a canal- or other fairly still water tributary... So not Hong Kong. Could be somewhere way up the river estuary on a side tributary- there are several low islands along the Hongqili and Jiaomen waterways that are densely cris-crossed with straight canals. If its from anywhere near Hong Kong- I would bet along there- tho it won't look like this anymore.
Maybe the first picture it is Tai O? Tai O is on the estuary of a river and does have stilt houses, as well as a modern bridge replacing an older one. On the other hand there existed a lot of fishing villages with stilt houses in Hong Kong, which were demolished. So maybe the houses on the picture don't exist any more.