Rocky beach with spectacular cliff scenery and great views. Approach by footpath through wooded valley; both valley and foreshore are an SSSI but I don’t see this as being an issue except during birds’ nesting season. When I was there yesterday there were some gulls but bo Oystercatchers! Can be busy in summer esp. at weekends. Pub in village is dog-friendly and does good food.
Keep an eye on the tide if you venture on to the foreshore; it is possible to get cut off if you don’t
That’s my neck of the woods 
Or at least the beach I consider one I have photographed lots of times as it is, excluding the walk down, 15m from my front door. Lots of interest along that shoreline including waterfalls, caves, etc and your only real worry is herring gulls - oh and as you mention, the tide cutting you off but only if you wander left or right as the footpath will remain accessible, if a little flooded. You also need to be aware that there are frequent helicopter flights around here as Wales Air Ambulance and HM Coastguard use it as a local base/area for training. Usually take off and land round the corner at Wick (by the lighthouse) or can hover out at sea for ages whilst, I guess, doing rescue training.
And interestingly, or not, I’ve never heard it called Marcross Cwm. To me, and those I know here, we have always known it as Monknash beach . Marcross is the next village over and is around the headland in your shot: see Where can I fly my drone in the UK? - Monknash Beach - Beaches and Seaside Resorts in Wales - the stream is Fynnon Fair (literally ‘fair wish’). I’m pretty sure, but not going to bet my life on it, that Marcross Cwm is what I would call Wick beach… and ‘All Trails’ agrees with me: red box around your photograph location and Cwm Marcroes is below it.
There is also an old watermill that you pass on the way down/back, but likely of little interest seeing how dry that step is looking. That can be very claggy due to wet clay/mud if you go wading in it. Whenever I go there, it usually looks like this:
or this:
One final, boring shot of me and my local camera club (which has the best name ever -BADASS), on what was one of my very first drone flights with my original 2nd hand DJI Phantom 4SE that shows the whole beach area and partially matches your shot:
Oh, and final word of note, if you go there for a sunset shoot, which is my usual, then make sure you have a headtorch as those woods you mention get very dark.
p.s. BADASS = Bridgend And District Amateur Snappers Society
i was off the beach br 18.00, and it was getting a bit gloomy even then under the trees! Had a torch with, knowing I would need it to flag the bus down (can’t afford a car and the WAG gives me a buss pass!). I’ve always been a bit confused a out the placenames bere, the village of Marcross being close to Nash Point and Monknash to this valley and beach.
The OS calls this stream Nash Brook and the valley Cwm Nash, and the stream running down from Marcross is Marcross Brook, but it enters the sea at Nash Point. Cant find out how to edit my title!
Bit of history though you might already know it; back in the day, this area was infamous as a wrecking coast. The participants were known in Welsh as Y dyn o’r seacs uchelwr, the men of the smaller axes, a hand-axe being a handy tool for climbing the sides of wrecked ships, cutting cargo free, and, if needed, witness disposal… They used to hang lanterns to the tails of sheep up on the cliffs to avoid the capital offence of showing false lights.
Big ‘ol galleon coming up-channel bound for Bristol and laden with the goods that made Bristol great, port wine & sherry from Portugal, tobacco & sugar from the Carribean, left it too late to come home in order to load the best of that year’s crop, caught in the autumn storms, blacker than the inside of a cow out there at night, shoals, sandbanks, cliffs, reefs, both sides and that ferocious tide, absolutely terrifying; small wonder that they’d gratefully assume any light they saw to be some fisherman who knew where he was and follow it…
Monknash village, including the Plough & Harrow pub, was the property of Ewenny Priory, and the monks would go down and give the victims proper burial, laying them out in the barn which is now the pub’s restaurant, but they don’t make a point of informing the diners of this!
Pirates. considered unworthy of burial on land or at sea, were executed (in Elizabethan times and earlier anyway) by being buried alive up to their necks in sand between the low and high water marks on these beaches, to be finished off by the incoming tide. Not a nice death, watching the waves getting closer and closer…
