Hong Kong is not just a city, but also nature. Actually, most of the area of Hong Kong state is mountain with steep peaks and forest. That is, why the city is spreading more vertically then horizontally.
What to do in Hong Kong? Beside the walking in crowded streets, you should definitely try some treks, or relax on small beaches.
The most popular trek is on Victoria peak. There are more options where to start the trek. Victoria peak is in Hong Kong island.
Another nice trek is to walk to Big Buddha statue in Lantau island. Start walking from Tung Chung metro station. Need to follow the trek route on the map (for example offline maps Maps.me). Along the way, there are even villages, which are quite in contrast to buildings in the city. From the Big Buddha statue, it is possible going back to Tung Chung metro station by public bus. There is even a cable-car operating to Big Buddha statue.
After trekking, you can relax on one of few small beaches in Hong Kong.
=== Knaper ===