I'm not a fan of big cities or living in them, but that being said, Berlin has to be more 'rural' and full of natural spots than any other smaller suburban places I've ever lived. The Germans really value their green spaces and you don't have to go too far to get to a forest, a park or a green belt. Last weekend we went to Britzer Garden for their Tulipan display. This place is 90 acres! When you climb up onto one of their hills you can see it surrounded by high rises. This is in the city.