Expires 4 months after purchase. Limit 1 per 2, 3 or 4 people, may buy 1 additional as a gift. Mandatory booking required. Check availability here and book here. 24-hour cancellation policy. Present Groupon on arrival. New customers only. Must be 18 or older. Under 18s must be accompanied by an adult. Valid for option purchased only. Verified using our merchant's website on 21 Sep 2016.