A summer trip to Blankensee, Mecklenburg in the former German Democratic Republic. Which is a long time ago (1949 to 1990), but you still have the feeling you go back in time. It is a great place to visit and we spend a week there at a campsite at one of the 1000 lakes in the area.
It was a very hot summer in the whole of Europe, so swimming and reading was all we did and it was good.