Varenna - Another attractive town on the Eastern shore opposite Menaggio and Bellagio. Worth visiting for the attractive and relaxing gardens of Villa Cipressi and Villa Monastero. Varenna also has the remains of a castle where a falconer gives shows occasionally. The castle is a steep hike, with a rise of many hundreds of vertical feet.
Bellano - Just north of Varenna on the east side. Nice non-touristed town, with a pedestrian only area in the town center. In the Italian tradition, most stores are closed from noon/1:00pm until about 3:00pm. Bellano was a silk production center, but those factories are now closed. The orrido (gorge) is geologically impressive, but most of the tremendous flow is now directed into a powerhouse.
Colico - nice views at the top of the lake, but the town's not that attractive. There is a WWI fort with guns nearby, but it's only open one day per week.