Greenbrier is one of the two smallest picnic areas in the park, with only 12 tables near a shady, boulder-strewn creek, plus a pavilion that seats 70 and can be reserved for $10. This picnic area off U.S. 321 is rarely busy, and it's one of only four in the park that's open year-round. The Greenbrier access road is partly unpaved and is partly one-way. There is a ranger station here and restrooms with pit toilets but no running water. The Ramsey Cascades Trail is nearby,
leading to the Ramsey waterfalls about 4 mi away.