In reply to tmawer:
It takes exactly 20min to drive from Chamonix to Vallorcine (up through Argentière and over the Col des Montets). It's also very convenient on the train if you don't want to drive (assuming work on the Montets tunnel is finished by summer, though a good bus service is in place until the work is finished). By the way, if you stay in the Chamonix or Vallorcine valleys, public transport is free on the production of a Guest Card which you can get from the campsite or hotel you are staying at.
The two main areas to climb in Vallorcine are the Vallorcine slab (Rocher du Saix) and the crags of Barberine and Giétroz above the French/Swiss border at the lower end of the valley. The former has the easiest routes up to three or sometimes four pitches and the latter a large selection of all different styles and lengths on perfect rock.