The Mariah Mesa Nature Trail is .75 miles and has interruptive signage along the way. The rest of the trails in the park are paths that connect the campgrounds and day-use areas together.
Travel east from Tuscon on US 60 E to US 70 E. Turn right onto US 191 S; follow for 5 miles and turn left onto W Roper Lake Rd
http://www.tripleblaze.com/trail.php?c=3&i=3429