Stockholm is comprised of 14 islands, with one dedicated to an amusement park. That alone should explain their joy for life. I arrived in the prime of summertime celebrations. A food festival went on in the main park, music festivals were held in churches around the city, graduation parties on the backs of trucks road down the streets and the Swedish national holiday was held which included the grand precession of the royal family in traditional attire.
The weather was idilic, the sun rose at 3:30am and set around midnight, and the people were jovial. If all three stayed the same throughout the entire year, instead of just one of the three, I would have placed down (temporary) roots there in a heartbeat.