Hi, the sand castles mission is possible at beach villa fronting east beginning on room 237. I had similar mission for my 3yo daughter.
WV 328 West Side has still and shallower water that more suitable for kid, unlike 407 family villa we stayed earlier which has constant current coming from mandhoo side and rough sand floor with sharp stones.
The 328 we staying could have some bug outside at nights, probably due to calmer wind and wave. Overall dirtier than the Family villa side.