Careno in detail
Careno is right along the SP583, and is easy to miss; it's between Km15 and Km16. Head down the steep, stone stairs from the road. It's located 15km north of Como, and 16km south of Bellagio.
The hourly C30 bus runs to both Bellagio (30 minutes) and Como (36 minutes).
There are roughly four ferries a day that make the trip between Como and Careno (40 minutes, one-way €4.60).