Stay an extra day in Munich if you have to for this
A fantastic museum. If you're looking for any early or late Renaissance artist, you'll find them here. A massive, thorough collection.
Among the highlights are several of D�rer's best, including his Self Portrait in a Fur Coat. Also impressive are the two rooms of Peter Paul Rubens. It felt as though his works broke the monotony of the surrounding Italian/Flemish pieces. Portraits, madonnas, generic religious scenes, over and over again - then enter the halls with Ruben's 8-foot wide hunting scenes.
A structural highlight is the staircases up to the second floor gallery.
Admission is fairly inexpensive, so the museum is a great value.