The zoo in Munich (called Hellabrunn) is one of our favourite weekend destinations with the kids. It's close by and as it's partly funded by the city of Munich it isn't that expensive. And as we go there often we bought a yearly ticket for all of us for 98€. So now we go even more often and just stay a few hours.
Last time I took a new to me Canon 100-300mm f/5.6 zoom and a Canon EOS 600 (both were given to me for free) and a roll of cheap drugstore ISO 200 film. I really like how the shots turned out, even though some of them are a bit boring. ;)