Driving from Fussen to Lake Como

I’m trying to see if I could easily drive to the Italian Lake area from Fussen. This would be in mid-June. I’d like to avoid toll roads and the vignettes I’ve read about. Lake Como seems to be the best known and easiest to get to...our time allotment is 3 nights...and then, on to Venice. I’m wondering if there are any apps or maps that help drivers stay off of the toll roads to not only save money but to have more scenic drives. We’re going from Venice to Florence, then to Siena for the Palio. This will be my 2nd Palio and I’ve driven through Italy several times...including the notorious Naples! (I got lost in that maze once). From Siena, we drive to Rome where we’re staying in Trastevere for 5 nights. I hate to have a car there, but I don’t want to leave it in a small town outside the city. From Rome, we drive back north to San Gimignano for 2 nights ...and a day trip to Pisa. From there, it’s north for 3 nights in Verona. I am planning on seeing a couple operas while there. The last leg is back to Munich. We have one night, if we want to stop in Ostisei...I’ve been to see Otzi in Bolzano and Alpe di Siusi, but my friend has not.
My question to all of YOU...You, who are so familiar with this area: do you see any areas for possible improvements on our schedule? We have almost a month to travel...we’re in no big hurry. I’ve used Eurail Passes during some summers holidays, but I like the freedom of a car. I’m realizing that parking will be an expensive problem in some areas....know of any places to save in that department? Splitting the expenses makes it more doable for us. I’d like to save on toll roads and see more of the countryside. Any advice and suggestions will be welcomed. Thank you for all of your help!
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