The Mont Blanc is not very far from Grenoble (2 hour drive?) and the Alpe d'Huez area. If you do go there, there are a few moderately easy rides to do in the Grenoble area itself (if you are interested I can map them out for you). Just for fun, you can also ride the course of this year's Tour de France time trial, which is a not-too-long and relatively pretty ride. Grenoble is not a huge city for culture but very nice for hiking and hanging out, and you'll find many outdoorsy folks there. A great many speak great English as it's a world-class hub of biotechnology research.

Then, there are a number of beautiful but more challenging rides in Oisans. We rented a cabin in Allemont and rode around to Galibier (challenging, obviously), up and down the Alpe d'Huez (not really that fun, but great views and some historic value of course!) and, our personal favourite, the Croix de Fer (Iron Cross). You can find lots of rides in this online brochure here: http://www.bikes-oisans.com/bike-oisans-cycling.html (They also have a mtb brochure at the same address.)

If you go to Grenoble itself - and probably the same in Chamonix - just find a bookstore. They always have books/booklets in the sports section covering rides in the area.

Or, just throw your bike on the train and spend the week hanging out in Paris, riding Velibs' all over town and eating all the croissants you can find. If you need suggestions of what to eat there, I'm more than happy to provide you with lots!