The ferry port at Cherbourg provides great access to bike routes in northern France. Here's one idea.
Distance: 336km
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This cycle tour explores the beautiful Cotentin Peninsula and can be completed at your leisure in 3 or 4 days through to a week or more. The section to the east covers key World War II sites, including D-Day beaches.
This is a beautiful area that I cycled in 2016 – see here.
If you don't have time for the full route, you can take a short cut from Carentan to Haye-du-Puits to cut the distance in half.
If you have extra time, then it is well worth a detour to the south to take in Mont St Michel.
Here is the elevation map.
