If you're planning to visit Mont St Michel
en route, I recommend spending a night nearby (we stayed at Les Vieilles Digues
which was nice and handy and not too expensive) and make either an early morning or an afternoon/evening visit to the Mont. We went for the latter and found that the crowds did abate somewhat. And then we we ate at a creperie 'La Sirene', above a gift shop, which is one of the few eating places on the Mont to get reasonable reviews on Tripadvisor.
You are supposed to leave bikes near the mainland car parks and take a shuttle bus out to the Mont. So it's an advantage to leave your luggage at nearby accommodation. We got away with ignoring the signs and rode out along the causeway (which is permitted outside the main visiting times), but that merely postpones the parking of the bikes. You still want good locks.
It's also worth visiting the German cemetery at Mont d'Huisnes
, even if you're not particularly interested in WW2, because it's on a hilltop with a very fine view of the Mont. After our visit and meal I pedalled over there, snook in (because by then it was closed) and took this photo:A microlight overflies Mont St Michel at sunset
by Chris Juden
, on Flickr