The purpose of the act is to safeguard free access trough the country side and maintain the right to spend time outdoors.

Access on cultivated vs uncultivated land:

Cultivated land:
farmyards, plots around houses and cabins, tilled fields, hay meadows, cultivated pasture, young plantations and similar areas where public access would unduly hinder the owner or user.

Acces:
Any person is entitled to access to and passage through cultivated land when the ground is frozen or snow-covered, but not in the period from 30 April to 14 October. However, this right of access does not apply to farmyards or plots around houses and cabins, fenced gardens or parks or other areas fenced in for special purposes where public access in winter would unduly hinder the owner or user.

It is not permitted to use sites on cultivated land for picnicking, sunbathing, staying overnight or the like without the permission of the owner or user.

Uncultivated land:
uncultivated land means land that is not tilled and that is not considered to be equivalent to cultivated land

Acces: Any person is entitled to access to and passage through uncultivated land at all times of year, provided that consideration and due care is shown.

Bathing:
Any person has the right to bathe in the sea from a beach in an uncultivated area or from a boat provided that this takes place at a reasonable distance from an inhabited house.

Sea:
Freely accesable by boat and when covered with ice. You are also allowed to land a boat on a beach for a short period of time (uncultivated area).

Picnicking and camping:
Prohibited when this may cause significant damage to young forest or to regenerating forest.
A tent must not be pitched so close to an inhabited house (cabin) that it disturbs the occupants, and in any case no closer than 150 metres.
Camping or another form of stay is not permitted for more than two days at a time without the permission of the owner or user. Permission for a longer stay is nevertheless not required in mountain areas or in areas distant from habitation.

How is this in the Netherlands?