Back in 1669, King Frederik III decided to create a deer hunting ground on a hilly area north of the city (probably the only hills you'll see in Copenhagen). After more than a hundred years the place was opened for public. Now it's inhabited by around 2,000 deer which are very easily found and are the main attraction of the place.
Although the deer of Dyrehaven are quite used to humans, they're not tame so you should admire them from distance, try not to scare them (because it causes stress for the animals) and definitely do not feed them. If the deer become tame, they won't be scared of humans anymore and so the gamekeepers will have to kill them because deer are big animals and they can cause harm to the visitors.
In the heart of the park, on the highest hill, the Eremitageslottet or the Hermitage castle is located. It used to be the king's hunting lodge.
Since the park is large, the perfect way to move around is a bike. Dyrehaven has a system of trails linked in star shapes, which was designed to make keeping track of the dogs while hunting easier.
As the deer park is best explored on a bike, we suggest to visit it during the warmer months, namely between May and September. However, if you prefer taking pictures of deer with great antlers, it's better to visit the park in autumn-winter. They lose their antlers in March-April.