I just returned from a great 2 week solo trip to Normandy, Brittany and Loire. I read Rick Steve's guide books listened to his podcasts and read the forum extensively. I spent hours planning my trip, reading books, interviews and movies. Overall wonderful trip with one disappointing city for a solo traveler and one horrendously horrible full day guided WWII tour. Can I make some suggestions: Rent a car, drive 2-3 hours a day max with a big jump of 4.5 hours if needed, travel "Rick Steves light". Stay in B&Bs or family run hotels with a restaurant. In Bayeaux the Rick Steves recommended (fantastic) restaurant Le Quarante-Neuf : Hôtel et Restaurant also has very nice rooms with morning breakfast.
The garden of Giverny was nice for the first 20-minutes of the day. I loved the walk along the Etretat cliffs, and the Jardins d'Etretat was a shady retreat after. I did not enjoy Honfleur as a solo traveler but just south, Château de Boutemont was one of my favorite gardens.
Among the Normandy Beaches, the Canadian Cemetery, British war memorial with it special Standing With Giants 80th anniversary statues, and the (other) American Cemetery near Saint James (in Normandy, I thought I crossed into Brittany but I did not)) were very impactful. The Overlord Band of Brothers Tour was so awful, go with any other Tour company. The guide was terrible, we didn't hear of Band of brothers until 6.5 hours into the 8 hour tour which was cut short and went only to two Band of Brother sites with no personal stories of the men. Such a waste of a day and money. Do it on your own, or by private tour guide for max 1/2 day. The Bayeux Tapestry exhibit was very well done!
Walk the entire way around Mont St Michel on the sand, the experience of the place is better than the abbey. Saint-Malo (where people really do wear blue and white striped shirts) and the Bergamote restaurant for a galette and desert are musts. Discovering the locations of the book/movie "All The Light We Cannot See" was fun.
Brittany was all about spectacular coastal walks, morning markets (I loved the Matignon Wed market), tidal islands and ferries to other small islands. In northern Brittany I discovered the welcoming Chambres d'hôtes des hirondelles (Swallows' Guest Rooms in Beaussais sur Mer) which was nearby to coastal viewpoints/walks Pointe du Chevet, Fort la Latte (Château de La Roche Goyon), Cap Fréhel, Chapelle Saint-Michel, Cap d’Erguy, and a little further northwest, île de Bréhat were all so beautiful.
In southern Brittany, Belle Île with its breathtaking views and the tiny Eden du Voyageur Garden, plus the Alignements de Carnac were memorable. Not an American accent was heard for 9 days. In the Loire, as recommended by Rick Steves, Château de Chenonceau was so fun, particularly the Ferme garden.
I did all this solo. Every B&B and restaurant were so kind to me. And no, I am not fluent in French but I have driven in France a lot - it’s all about knowing the signs and the lines and the rules of the road. Forty-five minutes from CDG airport was a real find of a B&B, Le Manoir du Cerf, a perfect ending to a great vacation. I am a 60-yr old solo traveler encouraging you to do it on your own.