We got in 2 days of sun, one lazing on the beach and the other on a boat trip around the islands. The later was entirely missable, the reef is dying and the day out is average. The rest of our stay it rained or was cloudy, so we caught up on our lazing around and watched the storms roll across the ocean. Some well earned recuperation

Nha Trang is missable and there isn’t much of “real” Vietnam there. That said we saw none of the surrounding area. You get out what you put in.