National Park Family Vacation Family Vacation Ideas?

Family Vacation Ideas? - national park family vacation

I want a family holiday for seniors 2, 4 young adults, 1 child to plan.
I live near Philadelphia, and it would be in a day's drive.
With a view to possibly to rent a house on a lake or in a national park. always goes to the coast of New Jersey and need something else.
We love outdoor activities and beautiful scenery.
Suggestions?