Promotional value expires 120 days after purchase. Amount paid never expires. Reservation required. Limit 2 per person, may buy 2 additional as gifts. May be repurchased every 30 days. Valid only for option purchased. Tours available from Thursday to Sundays, from 11:00 am - 5:30 pm. Reservation required 24 hours in advance! Only one Groupon per party/reservation. Only one Groupon can be purchased per account within 30 days. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings