In reply to Indus:
All the above links should help: as for family friendly venues, the following beaches are situated close to bouldering, rock pools and surf. Apart from Hartland Quay and Welcombe/Marsland all are lifeguarded.
Croyde Bay and Woolacombe
Hartland Quay
Welcombe or Marsland Mouth
Duckspool
Sandy Mouth (good kids' boudering)
Northcott Mouth
Widemouth Bay The first 3 are in N Devon, the rest in N Cornwall!