Geez, this is a good topic. I'm surprised it hasn't had more replies. If I can think of one album from my younger days which can always make me feel better, it would be Point of Know Return by Kansas. It's mostly instrumental with that rock/classical sound which was so unique. It makes me feel like I'm 16 again. My favorite track is "Hopelessly Human".
I never thought I'd miss those days at all. How weird is that.