Grenoble is OK, depends where the route goes. Advice would be, find a big hill, stand near the top, get there early (3-5 hours before it passes) – there is a whole cavalcade that comes before the riders pass, so get your hands on the following items as they are generally thrown at you (in no order): –
hats
PMU green hands
Haribo’s
Salamis
Pizza snacks
Bottles of water
If you go on a flat stage or flat bit of road, it literally is over in a flash…..