trip to Northern italy with grandaughters ages 10

My husband and I will be in Tuscany for 2 weeks with our extended family. Our children will go back to the USA leaving their daughters with us for another week of adventure. I would appreciate any input re. the funivia from Italy to Mont Blanc as well as places to stay that are comfortable and also have swimming pool - as although we will be north it still could be warm in mid July. Thanks, Giannetta