I like the slightly stale smell of a large body of water. Sort of like the watery freshness plus all the seaweed flora, some dead some alive, combine into the smell of adventure.
Tobacco smoke, but only when it is someone else who's smoking.
Tea tree oil is just great.
The cold. Fresh snowfall, clean freezers, and so on. I'm not even sure if it's a smell so much as a feel, your nose getting punched in its proverbial face, because most of those things have no reason to smell similar.
Cumin, fresh limes, almond extract, just some cooking favorites
Wet grass and fireworks smoke