Kraków-based tour company cooperating with Ojców National Park. English-speaking guides can be arranged by calling in advance or writing to ola@ecotravel.pl; hold onto your jaw, because the service costs about 700zł (in addition to entrance fees in some of the caves and castles), but lasts up to five hours and isn't quite such a raw deal if you have a bus full of people. They do bus-fulls.