Follow the banks of the Adda from Brivio northward.When you leave the promenade at Brivio it will change to a small street then to a broad walking/bike path.Follow north. After about 8km the path ends .Follow the minor roads near the banks.Lookout for pathes/small parks on the right.There are some new trails under construction.If you do right you will have not more than 2 km in total major road (SP72 via Roma

Follow the promenade from Brivio south.-->minor road-->broad path Points of interest: Bridge of Paderno Dam with electricity facility + gorge afterwards Trezzo sul'Adda might be a good start pointto continue to Milan.