During the conference of the European City Farms, we had site visits to a number of city farms and adventure playgrounds in Dresden.
The Johansplatz Abenteuerspielplatz is a lovely green adventure playground with a climbing wall, lots of cycling activities, a Bauspielplatz area (where the children can build huts etc) lots of trees and some rabbits. You can see their rabbits here and the photo above shows my favourite, not that you should have favourites amongst rabbits of course!
Eselsnest is a donkey farm and adventure playground with rabbits too. It's a very large area of sand and feels a bit bleak to be honest, but the animals are nice and they have lots of activities for young people. Eselsnest has a website here (in German only) but there are plenty of photos on this page here (click on each photo on this page to reveal a whole new gallery!).