You'll set out against a backdrop of Austin's skyline and the state capitol on this riverboat cruise and move upstream past Barton Creek and Zilker Park. Along the way, you'll glimpse 100-foot-high cliffs and million-dollar estates. These scenic tours, accompanied by knowledgeable narrators, last 1 1/2 hours. Slightly shorter bat-watching tours leave around half an hour before sunset, so call ahead to check.