All lakes in northern Italy/southern Switzerland are beautiful, surrounded by the Alps. I heartily recommend a visit!

I went to Lecco (a small town next to lake Como) with my sister on the way to the airport in Bergamo from Milano one time. We were there for an hour or so and fell in love. The next year we went on vacation in Lecco, using the trains and ferries to see the surrounding towns. And then we took another trip to see Como and then took the train to Tirano and the Bernina Express to St Moritz. Northern Italy and particularly Lake Como and the surrounding lakes are irresistible. You go once, you fall in love, and you go back whenever you have the chance.