I visited Brno out of season eight years ago, and while there were tourist attractions available, it was hard to get to some of them. The Punkva Caves only had buses twice a day, for example.
So instead we mostly stayed in and relaxed, which was a welcome break at that point in our trip and I remember Brno fondly because of it. And my wife was giddy with joy that she was able to find a copy of Infarkt in a comic shop.