Their engagement shoot was at the Austin town lake, since it was where Keith proposed to Leslie. He surprised her by hiding a ring in a geocache. Geocaching is like a global hide-and-seek, in which participants use a GPS address to track down little containers that contain a logbook, and sometimes a surprise treasure. In this case, the treasure was a diamond ring for Leslie!
Here is one of my favorite pictures, with the busy Austin construction skyline behind at sunset.