From Sierra Vista

Most people don't seem to believe this, but from many places in Sierra Vista, it's quicker to get here through Bisbee.
Take Hwy 90 East and turn right on 80 (some 12 miles or so on Hwy 80... through the tunnel, past Old Bisbee and then the Lavendar Pit) to the Traffic Circle.
Take the first (right) turn off the Traffic Circle, onto Hwy 92. From 92 turn left at the second streetlight (Naco Hwy).
On Naco Hwy, go 4.5 miles and turn right on W. Newell St. (you'll see the golf course on your right).

Or, if you're on the south side of Sierra Vista...
Take Hwy 92 toward Bisbee (after Sierra Vista, you'll pass through Hereford and Palominas).
Once inside the Bisbee City Limits (there's a sign) you'll turn right at the first streetlight (again, Naco Hwy), and 4.5 miles later, turn right on W. Newell.
How to get to Turquoise Valley
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