I'll agree with the others who say this is way too many châteaux and there are many other ways to spend your time in the Loire besides visiting châteaux and/or doing wine tasting. You've got a car so there is so much available to you at your free will. I personally like Amboise and find it a pleasant town despite the tourists but don't find the château interesting (though it is certainly significant in terms of its association with French history) nor do I find Le Clos Lucé interesting or worthy of a visit (though others obviously feel differently). I'd suggest visiting some of the lovely medieval towns in the area. Loches was mentioned and that is a beautiful little town and though it's château is just a medieval ruin it is a contrast to visiting the renaissance châteaux in the area. I would say the same for Chinon, a lovely medieval town with a medieval castle ruin notable as the residence of Henry II (King of England) and his famous wife and son, Eleanor of Aquitaine and Richard the Lionheart. It also has Joan of Arc connections as this is where she "miraculously recognized" King Charles VII. Saumur is another lovely town along the river but my favorite town is probably Blois, which also has my favorite château in the Loire. It is beautiful both inside and out and has decor and architectural styles spanning medieval times through the renaissance period.
You didn't mention visiting the Abbey of Fontevraud, a beautiful medieval abbey which is where Henry II, Eleanor of Aquitaine and Richard the Lionheart are buried.
If you head west driving along the Loire starting in Saumur there is a lovely and scenic drive along the river that will pass through the gorgeous little towns/villages of Trèves, Cunault and Gennes. If you want to do something different then there are also some prehistoric, megalithic sites in the area and if you buy a Michelin map then there is an icon on the map for these features and you can incorporate these into any scenic drives you might want to do. One of the largest and most impressive dolmens in France is located in the tiny town of Bagneux just south of Saumur. It is amazing but a great part of the visit is going into the bar next to it (where you pay a few euros admission) as it has been in the same family for decades and the decor inside is original from the 50's and 60's. It's a real time warp. If you can speak a bit of French the owner will be happy to explain the history of the bar and dolmen. It's been a few years since I've been there so I hope the bar is still there and operating and that the decor hasn't changed:
https://www.ot-saumur.fr/en/chips/bagneux-dolmen-5376808/
Research the tourist office websites for any town you may want to visit as they are loaded with info about what to see and do in each town/village as well as their environs:
https://www.amboise-valdeloire.co.uk/
https://www.bloischambord.co.uk/on-the-agenda/more-information/tourism-information-centers/office-de-tourisme-blois-chambord-val-de-loire-1525911
https://www.ot-saumur.fr/en/
https://loches-loirevalley.co.uk/
https://www.azay-chinon-valdeloire.com/en/
https://www.fontevraud.fr/en/royal-abbey/discover-fontevraud-royal-abbey/
The blog/website below has some good ideas for off the beaten path, pretty little villages you could visit:
https://thegoodlifefrance.com/the-prettiest-villages-in-the-loire-valley/
If you really want to do something weird and fun then look for the little village called Le Sale Village (which means "The Dirty Village"). There is a menhir in town in someone's yard that you can see from the street. Apparently the village got its name because one day a noble woman in a carriage came riding through town and upon exiting her carriage she stepped in some mud and exclaimed "What a dirty village!" So the inhabitants changed the village name from whatever it used to be to Le Sale Village in honor of her visit!