Promotional value expires Dec 21, 2014. Amount paid never expires. Limit 4 per person. Reservation required; subject to weather. 7-day cancellation notice or fee up to Groupon price may apply. Tours run rain or shine unless there is a threat of severe weather. Does not apply to specialty tours. Valid only for customers between 75 and 265 pounds, no minimum age required. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings