one coupon just works for two people(buy one for one person and get one free for another people), if you have 6 people, you have to buy three toursavers. this is why we bought two savers for same day-cruise tour for our 4 people.
if you already made your itinerary, you have to book it ASAP, space is limited for the coupons, I called for K2 jet tour, but they do not have the day we want. some tours they charge the cancellation fee once you booked, some you can cancel it before 10days without fee, you have to call them to make sure.good luck.