This hike can be up to 7.9 miles long and starts up near Zilker Park. You can choose the length of your hike, walk, or run. The easiest access to the Greenbelt, though, is through the Loop 360 Entrance. This location is filled with biking, hiking and running trails. There are great locations to have picnics. 

On the trail there are a couple of great swimming locations. When the water levels are right these are the access points to go to to find the best swimming locations:

1. Spyglass Access (1601 Spyglass Dr.): There is usually easy-access street parking at this location. Once you head down the hill at the trail access, take a left and you’ll find your way to the Flats & the Campbell’s Hole swimming spot.
2. Gus Fruh Access (2642 Barton Hills Dr.): You could get to Gus Fruh from the Spyglass entrance and just simply keep going, but you can take a more direct route and park in this residential neighborhood. The water in this location is beautiful and the swimmning is perfect. 
3. Trail End/Sculpture Falls Access (1710 Camp Craft Road): Here you will find the trails end, the famous Hill of Life and the Sculpture Falls swimming area. Be warned, however, that you’ll need to be ready for a half-mile uphill hike to get to the falls. The falls are small and beautiful and is a great location for family-friendly fun.

This trail is open year-round and have great activities for families. The best times to go are earlier in the day before it gets too hot and right before the sun sets.