What country are people happiest in according to your experience?

The happiest people I've ever met, by and large, are the Filipinos. They're a spiritual people, staunchly Catholic, very family oriented, and smile a lot. Laughter is as necessary to them as food.  You'll meet the occasional grump but those seem to be a tiny minority.

No, I've never visited the Philippines, but have met many in Australia. Wonderful people.