Cheyenne Mountain Zoo offers a "Boo at the Zoo" experience that we took advantage of. It was a little pricey (even as members), but it was well worth it. The kids put on for their first time costumes that their Nana made for them. Taylor was Dorothy, Callie was the Good Witch, Beckett was the Lion. There was so many people in costumes, the kids just loved it. We didn't get to see many animals (other than a freakish deer that jumped out of the woods and scared everybody), but it was still a blast.
We have a beautiful, big tree in our front yard that has left plenty of leaves for Brandon to rake and the kids to play in!