Jefferson Barracks' 4.2 miles of paved bike trails carve a figure eight through the center of the park, with no shortage of scenery along the way: The Dennis A. Shick Trail is flanked by native woods, meadows, a Frisbee golf course, ballparks, an archery range and historical markers from the Civil War. The path has moderate rolling hills that keep your body and mind alternately challenged and rewarded as each incline is conquered. The main trail filters into the Mississippi River Greenway, which runs parallel to the river, cuts between a flower-filled meadow and ends behind River City Casino. The breeze from the water is a welcome relief on a hot day, and the flat surface — save for the hill on the way down — makes it easy for a family of cyclists with varying skill levels to enjoy the beautiful Missouri landscape. 533 Grant Road, St. Louis, 63125. 314-615-5000, www.stlouisco.com/ParksandRecreation/Trails/JeffersonBarracksTrails.