For years, camping out beneath the stars along the South Yuba River at Purdon Crossing was a cool way to beat the heat for folks all over western Nevada County " and a summer tradition for Dan Chaplin's family. "It's an almost spiritual experience being out on the river after everyone has gone. As dusk settles onto the river, it gets really still and quiet," Chaplin said. Dragonflies and bats dart about. Sometimes a ringtail cat or river otter makes an appearance. Those romantic evenings of easy recreation access came to an end in May when the state park closed …