Stroll through the grounds of Mission San Tumacacori, established by Jesuit Father Eusebio Francisco Kino in 1691. Tours and cultural demonstrations are sometimes available, or use the NPS booklet to take a walking tour. The Juan Bautista de Anza National Historic Trail goes through the park. You could also hike the 4.5 miles to Tubac from Tumacacori.
If you go:
Temperatures are usually 5-10 degrees cooler than Phoenix or Tucson. Fee area. Open daily except Christmas and Thanksgiving. Wisdom's Place, just north, is a good place to eat, or find shops and restaurants in Tubac, 4 miles north.
Links:

1891 East Frontage Road
Tumacacori, Arizona 85640 USA
Mailing address:
P.O.Box 8067
Tumacacori, AZ 85640 USA
Phone Numbers:
Tumacacori National Historical Park
+1 (520) 398-2341
+1 (520) 398-2341
Juan Bautista de Anza National Historic Trail
+1 (510) 817-1323
+1 (510) 817-1323
Wisdom's Cafe
+1 (520) 398-2397
+1 (520) 398-2397