Tracks 66 and 67 (especially the latter) are pretty darn good.
Regarding track 71, I would like to mention that years ago, a designer on this very board created a hybrid track of half short-oval, half temporary street circuit which I found to be a particularly intriguing concept (maybe you can find "Syracuse" somewhere in the archives, if the gmap-pedometer link still exists. Your track layout reminds me very much of that concept.
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