Honfleur is very nice. There are some nice places around Caen. Pegasus bridge is a good tourist trail spot and there are canal towpath bike paths all the way into Caen. So flat and straight I'll be impressed if you don't end up racing! The castle in town is worth a look.
In the countryside beuvron en auge is quite a nice place for a lunch stop and there was a cracking bakery in troarn last time I was there.
The coastal stretch between cabourg and trouville is quite nice, the hill behind Benerville has some good views from the gun batteries if you can go (light) off roading.
(I used to lead cycling trips in parts of France. Knowing where the good places to buy cake and east lunch are help!)
Finally, if you've not had one before I recommend trying the pastry known as 'la religeuse'. You won't regret it.