For me, that's easy. I want to say it was 1998/99'. We took our then 2yr old boat from almost the Overton arm of Lake Mead to Pierce's Ferry at the mouth of the Grand Canyon. The boys had to be 10 & 15 or so at the time. If I remember correctly it was around 75mi one way. I'm pretty sure we didn't even need to stop for gas on the way up, but we did stop at Overton on the way back. It was a midweek trip, so we saw maybe 3-4 boats the entire way. I am not a good navigator, which was apparent when we had to get out of the boat and turn it around when we hit the mud coming out of the Grand Canyon. The rafting boats coming out of the canyon should have been a clue LOL.

That was a great trip, one I will never forget. It was so peaceful, the water and weather was amazing. And it didn't even bother me that I shaved off a piece of the top of my foot as I hit the prop crawling back in to the boat after taking a dip LOL.