Mountain Biking Greenbrier River Trail. Add a review. i am reviewing compared to other rail trails not singletrack.A great riding trail with great views of mts and the river.Not much of a grade but a little easier north to south.You will stay on the seat most of time so get lots of padding.Guests at Greenbrier River Campground are able to enjoy eight acres of picturesque riverside. The RV sites are lined with tall trees and have a great view of the river. The grounds also offer a bathhouse, laundry facility, swimming area, and a number of different water activities.The Greenbrier River is a tributary of the New River, 162 miles (261 km) long, in southeastern West Virginia, in the United States. Via the New, Kanawha and Ohio rivers...Camping and campgrounds in Greenbrier Campground, Tennessee. Reserve a campsite online or learn more about lodging and activities at Greenbrier Located on the Little Pigeon River & only 6 miles to downtown Gatlinburg, Greenbrier Campground offers RV, tent camping, cabins & more!