Tubac Presidio serves as trailhead for a 4.5-mile section of the Anza Trail which leads to Tumacácori National Historical Park and crosses the Santa Cruz River twice. Please call ahead for trail conditions.
Take I-10 E from Tuscon. Turn onto I-19 S at exit 260 toward Nogales. Take exit 34 toward Tubac, Go left on E Frontage Rd, 3rd right onto Plaza Rd, 1st right on Tubac Rd, another 1st right onto Burruel St.
http://www.tripleblaze.com/trail.php?c=3&i=3431