From Acadia's rocky shores to Zion's slot canyons, U.S. national parks are the crown jewels of national conservation. Here are seven particularly postcard-worthy state parks where you can marvel at similarly stunning vistas and find hiking, biking, rafting and wildlife viewing to rival the most popular national parks. Fall foliage and scenic drives: Grandfather Mountain State Park, North CarolinaMile High Swing Bridge in Grandfather Mountain State Park. Plunging waterfalls: Silver Falls State Park, OregonJOY PAN/GETTY IMAGESDupe for Yellowstone and Yosemite national parksSilver Falls State Park — Oregon's largest state park — is spread across 9,000 acres and is just a 30-minute drive east of Salem. Related: Mountains, desert and waterfalls: A points-fueled autumn road trip through Oregon's natural wondersRed rock canyons: Valley of Fire State Park, NevadaValley of Fire State Park, Nevada.