Stop by Huron Pointe Sportsmen's Association's outdoor Rifle & Pistol range!  To see when it's open, check out the H.P.S.A. calendar.
 

Huron Pointe  is located on 28 Mile, between Gratiot and County Line roads in Lenox, MI.  
The cost is $15 for adults to shoot, $5 for kids.  You can bring your own targets to staple up, too.

35800 E. Twenty Eight Mile Rd.
Lenox Township, Michigan 48050 
(It's approximately one mile east of Gratiot.)

If you're traveling east on I-94 towards Port Huron, take the Richmond/New Haven exit.  Turn left over the bridge, go a couple of miles to Gratiot, and turn right.  At 28 Mile, turn right again.  About a mile down, turn right to enter the front gate when you see the sign.  Go straight past the trap fields to the end, and you'll be at the Rifle & Pistol range.