I'm with those who mentioned horse smells. They bring me back to my days at camp when I taught riding-best days of my life.

Chocolate smells remind me of the apartment I lived in Milwaukee while in college. It was near the Ambrose chocolate factory, and why I'm quite sure I'm addicted to the stuff today.

And on occasion when I get a whiff of some maryjane in a park...lots of memories (and lost brain cells I imagine) from my Hippy Days (Years, really).

Smell of campfire...anytime I've been blessed with sleeping out in the woods.

Yes, smells evoke the best memories for me.