Roman (Czechia) did a very nice description of these churches. We used our own car to reach these sites and we found it very easy, even despite it is very dangerous to drive in Poland. The paintings on the walls are very nice. For those visiting Krakow it is not "far" since there is a motorway (there are a few in Poland but this picture will change in a few years due to the entrance of Poland in the European Union) connecting Krakow and Wroclaw (another UNESCO site).