Re: Geneva to Florence this Easter
why you would not take the train, I don't know. Easy round from Geneva to Milan and switch to a Red Arrow and be in Firenze before you know it.
Anyway, avoid Milan. I would be tempted to get down to the coast and take it slowly.
Do you know if you can enter the city with your car? ZTL is common and cars like mine are not allowed in at certain times (Euro3 diesel).