There are many small beaches around the perimeter of the island/peninsula, but the two main beaches are known as "Back Beach" (Bãi Sau)--a long straight open ocean beach--and "Front Beach" (Bãi Trước)--a shorter curved beach somewhat protected in a semi-cove:
YouTube video of Front Beach
Google Maps link to Front Beach
YouTube video of Back Beach
Google Maps link to Back Beach
Both beaches are subject to being partially or fully submerged at high tide, with well-constructed sea walls having steps down to the sand and spacious areas for walking between the street and the beach.
Freshwater showers are scattered along the coastline, even at some other smaller beaches.
The area around Front Beach could be said to be more friendly to Western tourists, with hotels such as the Mương Thanh located there.
However, local Vietnamese people appear to prefer the swimming waters at Front Beach in the somewhat protected cove
In general it seems that Back Beach draws more Vietnamese tourists, and the surrounding lodgings and restaurants are more geared to Vietnamese tastes.
It seems that more affordable housing for Western expats is available within easy walking distance of Back Beach.
Anyone feel free to correct my descriptions or assessments.
I'm just one myopic foreigner 😉
Also, if you have a favorite smaller beach, this might serve as a good thread where we can share our discoveries with each other.