Don't go through 90 from Benson to get there. The Interstate signs will direct you that way. It's the lame route. Instead take the S. Sonotia Hwy 83 from the I-10. You'll end up in Sonotia where there is a nice little gas station that intersects Hwy 82. Head east on 82 and until you dead end at Hwy 80. You'll be just outside of Tombstone. Stop there and have a beer and burger. Tombstone is the shiz. Then take 80 on down to Bisbee. That route is awesome.