The beach has been turned into a film set for the second time this year
Filming of a Robin Hood movie starring Russell Crowe and Cate Blanchett is due to take over much of a Pembrokeshire beach for the next fortnight.
A cast and crew of over 800, plus 130 horses, are due to shoot a major battle scene at Freshwater West.
Although the beach remains open to the public there will be road closures with people living nearby issued passes.
Last month the beach was used as a location for the final film in the Harry Potter series.
That saw a giant cottage made out of shells built on the sands with stars Daniel Radcliffe and Emma Watson taking part in the filming.
The Robin Hood film is being made by Universal Pictures and is directed by Sir Ridley Scott.
The filming involves more than 800 people, including 450 extras, 250 crew, marshals and beach cleaners.
It will also include boats and 130 horses, which will be stabled temporarily nearby.
Part of the film centres on the seaweed hut near the main car park.
The film has been shooting at locations across the UK for several months
Permission to use the site has been granted by a number of organisations including the Pembrokeshire Coast National Park Authority, the National Trust and Pembrokeshire Council.
A joint statement said: "We recognise that the filming will inevitably cause some disruption in the area as well as great public interest.
"We hope people will help us to accommodate the film companies and we hope that filming on this scale will bring numerous benefits to the local economy, both during filming and following through knock-on tourism spend.
"While it is difficult to quantify it is estimated in the region of £1m, including temporary employment, repeat visits by crews and cast, raising the profile of the area and use of local services - from food to vehicle hire, from laundry services to security."
The park authority said filming would be mainly at the south end of the beach with one day's filming at the seaweed hut.
It has also been told it will be part of the finale and include a battle scene with boats and horses.
The boats are being assembled in Pembroke Dock and temporarily moored off Dale.
Filming will take place mainly at the south end of the beach
Although the beach and coastal path remain open, marshals will ensure people do not wander into camera view.
There will also be marshals on water bikes to liaise with surfers.
The park authority said it had worked with Universal Pictures to protect the sand dunes and beach.
"The routes for access to the beach have been chosen carefully and fencing is in place to direct people," it said.
"Facility bases for the film crews have been selected outside of any Sites of Special Scientific Interest."