There are a few sites dotted around Croyde Bay in North Devon just south of Woolacombe and you can also park for the day on the front at Woolacombe or along Atlantic View (both chargeable in season). We stayed here back end of last season for a week and also spent six or seven weeks at Twitchen house site above Woolacombe but that one is a long hike down to the beach.
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www.parkdeanresorts.co.uk
In season there are a few smaller sites around Croyde bay quite close to the water.
If your reasonably mobile (I think ive mentioned this before) The Countryside mobility scheme hires out Trampers (all terrain mobility scooters) from Woolacombe and loads of other places. They are brilliant. Think the Landrover of mobility scooters. you can go off down the beach or up in the dunes and hills on those.
Countryside Mobility is for anyone who has difficulty walking or limited mobility. Hire easy-to-use, all-terrain mobility scooters at more than 60 stunning countryside and coastal beauty spots across the South West and beyond
countrysidemobility.org
Fantastic area all around there.