It's no coincidence that the word "muse" appears in "museum!" Museum of Brandy and Old Trades aims to educate and inspire its visitors, so squeeze it into your itinerary.
You're spoiled for sightseeing choice when in Valognes. Museum of Brandy and Old Trades is a good place to kick off here, but there are plenty of other fine spots to visit. Ecausseville Airship Hangar, Regional Cider Museum, and Orglandes German War Cemetery are near the museum and will fill in your day nicely.