UK holiday for families with cultural stuff and beach

[Fossilspartnersphone]

We're looking for a family holiday (maybe somewhere with a pool, kids activities for almost one year old) near a beach and walking and cultural stuff. Two adults and a current ten month old. Any recommendations please?

We’ve got national trust and English heritage passes and often use the map as an idea of where to go. Our recent trip to Cornwall took us to St Michael’s Mount, Tintagel, Lanhydrock, and the most beautiful beaches imaginable. But if a hike frol Edinburgh though.