Some friends of mine introduced me to a wholly unique experience: Underground Disc Golf. Basically, an old mine has been converted into two 18 hole golf courses, sand volleyball courts, a party barge cruise and live music venue. We played a round and it was both bizarre and a blast. Best of all, you play in a relative darkness that requires you to attach glow sticks to your discs--good luck if the power goes out. And it's pretty inexpensive at just $5 a round, plus whatever beer you purchase.
Check out the details here: http://www.dgcoursereview.com/course.php?id=5055