Alaska State Parks Parking Pass

If you plan to go on more than 8 hikes where you are required to pay a parking fee ($5 each time) it will be beneficial to buy an annual parking pass.  These are stickers you put in your window and allow you to park most places without needing to stop and fill out a form, post the paper in your window and pay your $5 every time at the pay stations.  The only location I can think this won't work is at the Eagle River Nature Center.  There, you have to buy a separate pass just for that facility. 
Here is the parking pass infromation for ERNC:  http://www.ernc.org/hours-fees.html 
 Here is the information for the Alaska State Parks parking pass:  http://dnr.alaska.gov/parks/asp/fees.htm