There are some good pull-throughs on the Dent de Crolles in the Chartreuse massif, just to the north-west of Grenoble, with lots of information available on the web. They are all very well equipped and the routes are actually sign-posted (the local rescue got fed up of having to go in for people!). The most suitable trips are probably Trou du Glaz to Guiers Mort, and Trou du Glaz to the Annette. Slightly more adventurous are the Trou du Glaz to the Chevalier, and P40 to the Trou du Glaz. Descriptions of these and others may be found in
A Travers le Karst by Darne and Tordjman. More information about the Chartreuse massif may be found at
http://www.braemoor.co.uk/chartreuse/.
In the Vercors, to the south-west of Grenoble, the Scialet Michellier is a Bar Pot type trip, and fun can be had in Trou qui Souffle, especially using the Saints de Engrace entrance. There are a number of other day trips, including the Gournier and the Grotte Roche, both in the Bourne Gorge. The guide book for the Vercors is the
Speleo Sportif Dans le Vercors by Delannoy and Haffner, but most trips in it are a lot more than Grade III day trips and it's getting out-of-date. The website
www.speleo-vercors.org is useful.