Our best view of the Villa came from a boat rented from AC Boat Rentals. From the lake, it is absolutely stunning, especially on a day when it is closed to tourists. The Villa is beautiful, and recognizable from Star Wars and Casino Royale.
We then visited the next day (a Tuesday when the walk from Lenno is open) and took the short hike from the lake up. You can also take a ferry boat from Lenno, but since we had already seen it from the lake, we opted to walk up. We opted for just the garden ticket rather than the building tour as well. We explored the entire Villa in about half an hour, but really enjoyed the more secluded parts of the garden that weren't overrun with tourists. The areas by the bannisters over the lake are the most scenic and romantic, but difficult to get a clear picture without someone walking through. My suggestion would be to go early.
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