The Danish capital may not strike you as a sand hot spot, but Copenhagen has two beaches close to the city centre, easily accessible by the local S-train. Here you'll find clean water, white sand and water temperatures around 20 C during summer. Amager Beach Park is the closest to the centre and offers 5km of bathing and a shallow lagoon - a perfect swimming zone. If you just want to swim but are not fussed about sand, dive into Havnebad, Copenhagen's harbour. The water is clean and clear and it's a popular spot for cooling off with the local city dwellers, and it's just a few minutes walk from the centre.