The Barton Creek Greenbelt is a prime Austin location for all things outdoors: hiking, biking, rock climbing and swimming. The limestone cliff sides, natural swimming holes, dense vegetation and overall peaceful, rustic atmosphere out of the city and deep into nature make the Barton Creek Greenbelt a popular destination for both locals and visitors. Enter the Greenbelt at Zilker Park where an easy trail introduces you to the terrain. There are no water fountains on the Barton Creek Greenbelt trails so it is advised to bring your own bottle.