We stayed there this summer and really enjoyed it. I agree with others, if you want tourist towns and lots of attractions it's probably not the right choice. It's one of those areas where you drive through villages, all the windows are shut and you don't see a soul. Beautiful window boxes tho, so people must live there ;)
If you like peace and outdoorsy things, then it is There are good points about it being less touristy. There was hardly any traffic, didn't have to fight for space anywhere, the supermarkets weren't that expensive, nor the few drinks & snacks we had out. The national park was beautiful. The lakes loverly.
We'd started our trip with a full on visit to DLP, then a few days elsewhere. We were ready for something at a different pace ;)
We stayed here
www.vacansoleil.co.uk/camping/info/inland-france/jura/clairvaux-les-lacs/campsite-fayolan-le/VGB/5/2 041008/view.php
The kids were more than happy to spend their days alternating between swimming in the lake and swimming in the pool.
It was on one of the smaller lakes and the water was very warm (late august) and clear. They put a very graining, rough sand on the beach area, and start of swimming area. So you didn't have to wade through water weeds or anything. The kayak & canoe hire was great value. We'll go back to the area at some time.
We've also been to the Vosges, they're also very pretty.