We took the Rotterdam Metro train right out to the beach at the Hoek van Holland. That is the Hoek (corner) of Holland, not the Hook of Holland. And that is the corner of the province of Holland, not the "country" of Holland, which does not exist.
A lazy lunch in a beach restaurant with a view of the busy entrance to the port of Rotterdam.
Yes, dogs are allowed in restaurants. They are even provided with a bowl of water.