It really shouldn't be hard. As you're walking out, just hand it to someone walking in. Even for our State Fair with the coupon racket that is used, I've been handed a string of tickets walking to the gate from someone that bought more than they could use. Funny timing though, I had already pre-purchased tickets that I didn't even use. On exiting, I gave away what I was given plus what I didn't use.

The fact that there's not a stand/bin with a "need one, take one" type of sign is kind of head scratcher