Our Groupon summer 2014 Sea Kayak Halkidiki promotional offer! Groupon (www.groupon.gr) is a marketing service that offers its subscribers daily discount coupons by email, Facebook and Twitter feeds. For summer season 2014, Sea Kayak Halkidiki has decided to co-operate with Groupon in order to offer our customers a promotional discount. Please check it out and share it! You can see the Sea Kayak Halkidiki Groupon offer in the following