Check out http://www.tarheeltrailblazers.com. There’s a map of all the local trails, descriptions and reviews. Lake Norman State Park is probably the most fast and flowy we have, and 30 miles. Renaissance is old school rooty singletrack, probably not what you seek. Lots of shops in the area have demo bikes available to rent. You can post up in the Shop area of the forum if there is a particular bike you want to check out.