OK, so I didn't sail. But I saw water. In fact, from the top of the ski lift I saw what must have been a metric crapload of water. At least I think Lake Tahoe is that big.
So I went down near the water for a more up close and personal view of this "lake". I walked down a dock and thought, "wow this is some shallow water for a dock to be in, I can see the bottom". I was then told it was about 30 feet deep and I said, "shut up." So, I never actually got a good answer on how deep it is.
But if it is 30 feet that close to shore, I can calculate that times a diameter of "really far to the other shore" times a circumference of "72 mile scenic drive around the lake" and I might be spot on with the metric crapload of water measurement. I'll check my calculations again, just in case it's really a cubic crapload, I get them confused.
Oh, and eating lunch one day we had a view of a marina with three mostly winterized sailboats still in the water. Oddly enough, nobody was sailing. Just like me.