Is the Shore Excursion discount combinable with the Shore Excursion credit from Norwegian's Free at Sea™ offer?

Yes. The discount is combinable with the Free at Sea™ promotion. It is not combinable with any other promotion or discount. If a Free at Sea™ shore excursion credit is on the reservation, the Free at Sea™ credit is to be taken off the total bill first and then the Latitudes shore excursion discount is applied.