During my visit to Ventspils beach we could hardly walk along it, because it was so windy!! However, we still loved it because the sea is wide and super clean, there are lots of facilities nearby and even kids amusements and changing areas on the beach itself. We did not dare to try swimming but I am sure its lovely if its not so windy and cold. Another great thing about the beach is the wooden walkways taking you to it has lots of buckthorn trees (try some of the sour berries, apparently they are good for you), and also has areas where you can just relax and sunbathe.
Must visit if you're in Ventspils!