We have been to La Grappe D'Or a couple of times and if you choose your pitch carefully if would be a nice site to stay for a week. It is used by a lot of overnighters to and from the Med so if you can get there by early mid afternoon you will get the best choice of pitches. There are superb views from the site over the surounding countryside. Have a look here for more info http://www.davidklyne.plus.com/camping_la_grappe_d.htm
Grappe D'Or is in a beautiful setting but I remember that the pitches were very cramped together, a great area for cycling; la Forge St Marie is a good site for a short stay but we didn't think there was a lot to do in the area...and I'm only 5' and of slight build but found the space in the shower cubicles very restricting.