Coppertone sunscreen. Actually, I like the smell of almost any sunscreen, but Coppertone always takes me back to my youth.
Noxema
Vicks Vaporub
Yankee Candle's Sun and Sand scent (It reminds me of a combination of Coppertone and Noxema..a win-win for me
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Everybody I've ever mentioned the Noxema-smell thing to re. Sun & Sand has looked at me like I was on angel dust, but I swear that's what it smells like to me! It TOTALLY reminds me of the beach because when my brother and I were little and got sunburned, Noxema is what my mom slathered on us. Instant flashback.
Personally, these are other things I love the smell of...
gasoline
lighter fluid
the kind of permanent markers that aren't widely available anymore because inhaling the fumes from them kills brain cells
fresh asphalt
the exhaust from the cars at Tomorrowland Speedway
waterproofing stuff, like for decks (my brother jokes that I'm a huffer waiting to happen

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Philosophy's Amazing Grace
Aquolina Pink Sugar
Bath & Body Works stuff: Limelight (RIP), White Citrus, Rainkissed Leaves, Dancing Waters, Vanilla Bean Noel, Eucalyptus Spearmint
any citrus fruit
the inside of POTC (the ride, not the actual pirates)
Michael's craft stores (I think it's the dried eucalyptus)
any coconut-scented sunscreen, or coconut macaroons