Wonderful Copenhagen, the Denmark capital’s tourism office, is launching a pilot program that rewards visitors for going green. Starting July 15, participants who engage in a sustainable activity will earn a gift of appreciation, such as a free kayak rental or coffee and Danish pastry.

       The new initiative, CopenPay, is simple: partake in an eco-friendly endeavor and receive a perk from the two dozen businesses and institutions participating in the program. It is open to visitors and locals.