Just three miles from downtown Copenhagen, and easily accessible via metro, Amager Beach Park is one of the highlights of the city. The beach itself is a luxurious stretch of white sand along a sheltered inlet, with soft dunes and plenty of room for sunbathing. The water is unsurprisingly frigid, so best left to those with polar bear constitutions, but there's plenty of fun to be had on terra firma, including cycling, rollerblading, and walking along the promenade.