I am looking for excursion recommendations for Celebrity's Best of Scandinavia cruise in June. The ports are Copenhagen, Helsinki, Tallian, Stockholm, Visby, amd Skagen. Are any of those ports easy to do on your own? Is there anything to do or see within walking distance of the ports? In which ports would you recommend doing excursions? Can you recommend any specific excursions? This is our first time to Scandinavia. All input appreciated!