Camp fire at the beach? It is okay but keep it small.
Public rights on the foreshore and in tidal waters have a long history and tradition in Denmark. These rights have not been fully defined but include shooting wildfowl, fishing for sea fish, gathering some uncultivated shellfish, lighting fires, swimming, playing on the sand and picnicking.
Regarding lighting fires at the beaches, it is only allowed in the part of the beach where there is no vegetation. Normally the land between the high-water mark and the low water mark.
If you do wish to light an open fire, keep it small, under control and supervised. Fires that get out of control can cause major damage, for which you might be liable. Also, if your fireplace can be mistaken by other people for an uncontrolled fire – they might alarm the fire Department. And you will might be held liable.
Do not cover the fire with sand when you leave it. The embers can stay warm for a long time and maybe cause burn injuries if someone steps into it. Use water instead!
Source: The Danish Environmental Protection Agency, mst.dk.