Blomidon or Lunenburg?

My in laws will be visiting Halifax in July and I want them to have a great experience. Due to time constraints, I am deciding between a trip to Blomindon Provincial Park or Lunenberg with Peggy’s Cove on the route.

For background, we will also be spending 2-3 days in Cape Breton. They are easy going people and would enjoy most things. Any opinions would be greatly appreciated!