I've been to very many parks in different countries. There are many really nice parks in China, partly because Chinese people actively use them for all kinds of activities and sports, moreso than people of the West do. You'll see big groups of people dancing, doing t'ai chi, playing badminton and so on. Many are elderly people too, and there are many outdoor gyms as well. They just have a different park culture in that country.

I also like Central Park quite a lot. Partly because of it's size, but also because there's a lot of stuff going on there. Botanisk Have in Aarhus is also quite lovely.

When it comes to taking strolls I also find taking walks in cemetaries, especially big ones, is really nice.