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I like your #2 shot the best here. I am out traveling so I am viewing this on a smaller screen, but it looks like your were shooting at the Grandstand, not at the Racetrack proper. Which would account for the lack of rock trails. There aren't very many in the Grandstand area. The rock trails can't be blown away, and they survive the rains too. Sometimes people stop too soon when going to the Racetrack, maybe you did too?