For just an evening, I’lld head to Kødbyen. Not too far from the central station, plenty of bars and places for food.

Look for a Havnebadet if you’lld like a swim. Havnebadet Fisketorvet and Islands Brygge were very nice, but there are many more! Or just head to Amager Strandpark, it has also a very relaxed atmosphere on summer evenings.