Saving Money on a Zoo Membership

In the mail, I received a coupon code for an Akron Zoo membership if I sign up online.  I've had money set aside to buy a membership since we got our tax return and I was just waiting for the weather to get nice enough to go.  The coupon code is good for 15% off the family membership until July 14.  I'm going to hold onto this so that I can order before we go.  I was planning on paying $71 but now I'll only be paying $64!