It gives you the freedom to walk across fields and pastures as long as you don’t damage anything and close whatever gates you might open to get in. If there are cattle where you cross you are not to disturb them either.
When out in the nature you have to make sure you don’t disturb too much, if you make a fire don’t use living wood (use sticks from the ground if you don’t have fire wood with you).
It is also allowed to camp For one night almost everywhere (not in people’s gardens though), then you can set camp in another location and so on. Great way to spend your vacation!!