Tons, but especially "Eyes of the World" by the Grateful Dead. Also "The Wheel" and "St. Stephen."
I don't think St. Stephen is sposed to be a feel good song but there's just something about it...
Incidentally the story goes it's about Stephen Gaskin, Ina May's other half.
The weirdest one though is "Wreck of the Edmund Fitzgerald" by Gordon Lightfoot. DH and I share this one. Weird to have a feel-good song that is a true story about a horrible shipwreck and people dying, but I think it's the old bard-like story-telling cadences of it and the quintessential Michigan-ness of the song that makes us live it. It just feels so homey and belonging-ish. Still weird though that we put it on to feel good!