2 blocks tops
Check here for campsites closest to the beach. All are within a 3-5 min walk. "EdistoBeachCampgroundMap" https://embed.widencdn.net/pdf/plus/scprt/sybh8jjal4/EdistoBeachCampgroundMap.pdf?u=sgt8lu
The campsites are practically on the beach. Extremely short walk
You don't really want to beyond the beach side, there is no shade
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