Have someone special to take out to dinner? Le Rouge in the Old Town is always listed as the most romantic one. A lot of restaurants have Valentine’s menus. Go to Östermalmshallen or Sturegallerian and have oysters and champagne. Remember you are in Stockholm so book early!
What else can you do – get candles, red at Åhléns, buy candy and chocolates at Eje’s choklad on Erik Dahlbergsgatan on Gärdet, and buy gifts ANYWHERE.