On the way down, he stopped in Park City, KY to visit "Bell's Tavern" which is a very large structure burned shortly before the Civil War. The place is immense and quite impressive.
The first series of caches could only be accessed from the Columbia River. The first one was an old Victorian-era water tower which had a cache at the top.
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The second cache was the original entrance to Andrew Jackson's first house in Nashville. It's a river-accessible tunnel that is about 200 feet long and "L's" to the right after 150 feet. The tunnel empties out into a sinkhole-type area with a stairway that led to the original house. The cache was under one of the stairs. Needless to say, the area was quite creepy but the site was pretty awesome also.
The next day was spent boating and hiking up and down the Stone's River which was followed by a visit to the Stone's River Civil War battlefield. All-in-all, it was a fairly exhausting trip, but quite successful and a lot of fun!