We left the Balaton Lake area and travelled on towards Budapest. On the way we stopped at a town called Tapolca, where there is a lake in the caves underneath the town. [This is a limestone area, like much of Hungary seems to be; are an abundance of caves and, most of all, hot springs – this really does seem to be the spa capital of Europe.] We visited the caves, where you paddle your own canoe – well, flat-bottomed metal boat, (made of metal so it doesn't fall apart when you hit the sides of the cave – as you do!).
This was a very pleasant town and a lovely way to spend an hour paddling under the town.
We also stopped off at a town with a beautiful 'altstadt' (the German word seems, uncharacteristically, much more succinct than 'historic-town-centre' in English).