Are you going to stay in Munich and try to drive to different places every day or ar you looking for a resort close to Munich?
For day trips consider
Steinplatte, Austria or access via Reit im Winkel, Germany
St. Johann im Tirol (near Kitzbuhel)
Obertauern (not too far from Salzburg)
St Johann & Steinplatte are small compared to your typical Alps skiing experience and are more similar to eastern US ski areas. Not sure how to describe Obertauern, but lots of off piste opportunities. Maybe like A-basin or Loveland.
If you're looking for a nice resort area not too far from Munich consider:
Hintertux and the entire Zillertal area (Mayrhofen is the main town)
The Arlberg region (St Anton, Lech, Zurs, St Christoph, Stuben)
Of these, the most varied is the Arlberg region.
Ischgl is pretty cool for decent skiing and night life
Hintertux offers a snow guarantee because it's glacier skiing and quite high. Innsbruck is always iffy because it's fairly low and if it's a poor snow year in Europe you'll be shopping instead of skiing. I never liked Garmisch because there are too many Americans there.