Cycling holiday Brittany, France

Hi there,
Has anyone got any tips or suggestions on vegan-friendly food or places to eat in Brittany? My partner and I are hoping to do a cycling tour for two weeks in August. A bit of the coast, a bit of the inland area I think.
I'm quite used to being in the bike saddle - cycle nearly every day. And I have done a couple of long-distance campaigning bike rides over several weeks but all my stuff was in a van on those long rides and I have never actually had a holiday on a bike. So any tips on that would be welcome. I already know to be prepared for sore bits! Also, we are hoping to camp. So any recommended campsites in Brittany?
We also want to do some kayaking so if anyone has done that too in Brittany?
Finally (you can tell I am in the early planning stages of this, can't you!) I have no idea about how full French campsites get in August - I imagine they must a bit. Does anyone know if you can just turn up with a small backpacking tent at any time? Or do you have to reserve well in advance?
If anyone has done a similar trip or has any ideas do let me know. Thanks!
Dawn
Has anyone got any tips or suggestions on vegan-friendly food or places to eat in Brittany? My partner and I are hoping to do a cycling tour for two weeks in August. A bit of the coast, a bit of the inland area I think.
I'm quite used to being in the bike saddle - cycle nearly every day. And I have done a couple of long-distance campaigning bike rides over several weeks but all my stuff was in a van on those long rides and I have never actually had a holiday on a bike. So any tips on that would be welcome. I already know to be prepared for sore bits! Also, we are hoping to camp. So any recommended campsites in Brittany?
We also want to do some kayaking so if anyone has done that too in Brittany?
Finally (you can tell I am in the early planning stages of this, can't you!) I have no idea about how full French campsites get in August - I imagine they must a bit. Does anyone know if you can just turn up with a small backpacking tent at any time? Or do you have to reserve well in advance?
If anyone has done a similar trip or has any ideas do let me know. Thanks!
Dawn