Visit the Ripple Rock Nature Center, located on the Scenic Drive, just south of the visitor center. Kids can spin wool, pretend to milk a cow, make cornmeal on a prehistoric grinding stone, identify fossils or play with animal puppets.Visit the Ripple Rock Nature Center, located on the Scenic Drive, just south of the visitor center. Kids can spin wool, pretend to milk a cow, make cornmeal on a prehistoric grinding stone, identify fossils or play with animal puppets.