Luzern
This is a very short trip, you will not have time to see much. Anywhere further would eat up time getting there.
If you land at 08:00, allow 1 hour for disembarking and immigration, 70 Mins by train from Zürich airport station to Luzern, you could be there 10:30-11:00.
"depart at 12:00 p.m. local time on Monday" - that 12 noon (12:00), or 12 pm (24:00) at night? I don't understand am/pm, too complicated. Either way getting to the airport from Luzern is easy.
Luzern gives you an old town, a lake with boat trips and local mountains to go up if you get a good weather day.
360° panorama of Luzern. Station is to the left of the bridge, old town to the right: http://tour.luzern.com/360/en/
Official tourist info and hotel booking site: http://www.luzern.com/en/touristinformation-lucerne
A mountain you can go up from Luzern (train + cable car), with a glacier at the top: https://titlis.ch/en
Where are you coming from / going to? Are you flying from home just for these 3 days?