In reply to Derry:
Whenry could have possibly got the Prom and Long Rock swapped over; there's history in the guide book that these two were once swapped in name which caused Coastgaurds a headache in emergencies!
There are stakes in the right places above the Promontory (the first bit near Croyde) and you could have fun on anything from Freddie to Straight and Narrow. Long Rock has a committing access - ab / safety rope needed to get to the ab rope.
Watch the tide times too... as the left will give wet feet (and there are waves due) and the right will need a long rope.
As for space... not above the cliff... but the VERY top of the hill, either path will do, there's plenty of room but I'd go with Iain and go for Croyde - NT cheap car park, sand, rocks, pools and ice cream and the climbs are a 20 minute walk away. Vodafone coverage is variable from the cliff top so agreed times is best.
I can also put you in touch with someone to belay and climb?... also on holiday?!