The train ride sounds nice. I love traveling by train. I thought there might be some neat thngs to see along the way if they drove but I guess not. An 8-hour drive seems longer if the scenery isn't that great.
The day trips from Munich look awesome! Someday I so want to go back and see more! Thanks for the answers Martin, I was curious.....

with so much family across Europe it's inevitable that we'll head back in the next few years. Now I know exactly whose brain tp pick!