In reply to joeydurkin:
"Quick" by car in Genève is an interesting concept.
There's a huge amount to do in the Aravis and Chablais. Les combes des Aravis are reliable and pretty accessible.
Either search on camptocamp or pop into Cactus and get a copy of http://www.olizane.ch/article.php?IDrecord=106 which covers the Haute-Savoie and Mt Blanc.
Slightly further afield the Swiss side of the massif du Mont Blanc (around Trient / Finhaut) is feasible in a day from GE and has a lot of good tours.