Hwy 21 is very nice. But if you want a diversion with tighter twisties and good pavement, I enjoy jumping off at Potosi (West on Rt 8, a good place to get gas) and then immediately turning left onto Hwy P heading out of town. This will turn into Hwy DD. Turn left at Hwy 32 which will take you back to Hwy 21 just North of the park.
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