Originally Posted by
ajax
Second, there are likely to be a handful of public holidays during that stretch, especially in Munich and Paris (for instance, May Day). Just check that this doesn't clash with your trip too badly, otherwise you may find that certain attractions are closed and that transport will be running on a reduced schedule.
As fare as I can see there is only one - 1 May, when the OP will be in Munich.
Shops and banks will be closed. Tourist attractions will almost definitely be open (and somewhat crowded). Public transport will run to a Sunday time table which - in Germany at least - tends to be only slightly reduced over the weekday schedule.