an easy XC:
after take off go to the south (your right). Follow the cliff and cross the 'Manival', a little valley. Work the first thermal and go up to the crest of 'Saint Eynard'. Follow this crest to the south until a beautifull old 'fort'. Come back with the same way. After 'Manival' valley you can go up the the 'Dent de Crolles' summit and follow the big crest to 'Le Granier' summit in the north direction. Come back at 'St hilaire' and land near your car :-))
be careful with South wind.
In spring, conditions can be quite hard, specialy near the cliff.
access
Take off is just near the funicular station in Saint Hilaire village. If you come from Grenoble, cross 'St Nazaire' and go to 'St Pancrasse'. Cross 'St Pancrasse' and turn to the right in St Hilaire village, after the fireman house. The takeoff is under a big chalet. The south takeoff : don't turn after fireman house but park your car on the parking, on your right after 100m. Walk on the track (5mn), take off is on your right.
Bus from/to Grenoble (sorry only in french) : http://chvd.org/spip.php?article63
It may be a wise idea to leave the car at the landing site and go up by the funicular. Timetables and prices: http://www.funiculaire.fr/
regulation
You must not climb over 3000m.
This flight regulation is due to the Lyon International Airport proximity. Please don't mess with it !