Westward Ho! is lovely large sandy beach with rock pools on the southern side to explore at low tide. It also offers perfect perfect surfing for beginners and intermediates – works all tides except high https://magicseaweed.com/Westward-Ho-Surf-Report/1351/
Plenty of other great beaches including Saunton Sands, Croyde, Putsborough and Woolacombe
There is also great kitesurfing at Westward Ho!