Red Wharf Bay, Anglesey

When the tide is out, Red Wharf Bay unrolls into roughly ten square miles of mirror-flat cockle sand, and for a drone pilot that's about as forgiving a canvas as Wales offers. You launch from the little car park beside the Ship Inn, walk out past the moored dinghies, and suddenly have limitless clear space in every direction, with no cliffs, pylons or crowds fighting for the same frame. The estuary of the Afon Nodwydd draws lovely serpentine channels through the sand that look superb from 80 to 100m, especially in low golden light with Llanddona and the mainland Carneddau behind. It sits on the quiet east side of Anglesey, well away from RAF Valley, so there's no controlled-airspace headache. Two honest warnings. First, the tide floods back over that flat sand faster than you would believe and it is a genuine drowning risk, so know the times and never chase a shot outward. Second, those sands are a working cockle bed and a feeding ground for oystercatchers, curlew and other waders, so gain height promptly and do not buzz the flocks. Calm weekday mornings at low water are the sweet spot.