Here are European blueberries aka Bilberries. Very common wherever I was.
I'll try to answer ahead of time>nationality
22 years>how did you get to where you were
Plane to Helsinki, night train to Rovaniemi, bus takes you all the way through Lapland all the way to Utsjoki on the Norwegian border, multiple dropoffs along the way>date
Late September, early October>temps
Mid to high 30s during the day, dropped below freezing at night>weather
Cold and dry, hailed once, got a dusting of snow once. No rain IIRC>northern lights
Saw them very faintly one night. Nothing like the long-exposure photos they make of them, of course>stargazing/light pollution
Not perfect but still great, there was some light pollution from a nearby town. I should have gone further north. Bortle 1.5 probably.