Travel by bus from Munich to National park Krka. Currently international buses does not stop at Krka, which mean you have to get of the bus from Munich in Sibenik, timetable you can see below(use search field above to see departures for a specific date.) Once you arrive at the bus station in Sibenik, you should then get on a local bus to either Skradin or Lozovac, to Skradin there should be the most buses as it is only 15 km from Sibenik. 300 meter from the bus stop in Skradin you have boat to National park Krka, if you drive to entrance Lozovac, you might have to walk a bit more to get to the park entrance