I have this #5 behind McKinney Roughs, Walnut Creek, River Place, and Barton Creek for near-Austin hikes (with Hamilton Greenbelt in Lakeway #6). Don't be fooled by the loop on the map here. That is the serene loop and its far less interesting and shorter than the rest of the park. Head to the right on one of the two trails instead of going left to Serene Loop. They will intersect, and then had left on the Canyon Descent Trail. You head down and then eventually back up in a loop through the park (though avoid the Rim trail on the way back its about the only dull trail in the park). Download the city of Lakeway map as you will need it to find your way around. Great trail in a nice area! Well worth the drive.