This is the exact spot where to take the taxi boat to Villa del Balbianello. You can either purchase one way or return tickets, as of 2023 the return ticket was €9. Hopefully, it hasn't changed this year!
The ride takes less than 10 minutes, but for me, it's the best way to reach the villa. You get to see it from the lake and it's absolutely stunning.
If you are lucky like I was and take the first ride in the morning, you might have the whole boat to yourself :)