Reading this book by Kevin Fedarko. It's inspiring me to boat the Grand Canyon by wooden boat (dory) Anybody else done it? It's very expensive, but you can join the lottery with the park service and get a slot. But then you need to get boatmen/women to haul you down the canyon.
In any case, I highly recommend the book. Adventure the likes of which we will probably never see again in this country. Reminds me that we need to go and see this country, the natural beauty, while it's still there. Here's a video to whet the appetite:
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