Originally Posted by CarmenOM

....Gotland in Sweden. It's a long ferry ride or short plane ride from Stockholm.

Stop reading now if you are planning this trip for the winter.

Gotland, and its walled city, Visby, are lovely and charming:

Remnants of the Vikings and of the Hanseatic League trading center that Visby was in the middle ages. Fun to explore on foot but not big enough to be exhausting.
Beaches with swans swimming in the Baltic.
Flowers everywhere.
Countryside scenery with bike paths all over the island.
Medieval churches, some in ruins, scattered around the city and the countryside.