Recommendations for a day trip to Lake Como from Milan.
Varenna is the easiest to reach by train (70 min). Varenna is a quaint lake town on the mid-lake area (the best part IMO)
There are ferries that cross the lake from Varenna to Bellagio also.
Check train schedule on www.trenitalia.com
It's an easy trip by train. Varenna is a nice place to visit while Como is bigger and more to see. Depending on the time of the year a lake cruise around the lake is a good activity. We've been to Lake Como twice and enjoyed it both times.
Buon viaggio,