Pine Grove Furnace State Park at 1100 Pine Grove Road, Gardners, Pennsylvania.

Oh, I absolutely adore this place! I've been going to Pine Grove every Summer and Fall for the past 10 years and it just keeps getting more and more beautiful. If you're going to Fuller Lake on a super hot day, the beach can be a bit crowded, but not to the point where you can't enjoy floating around on a tube in the water. They do a great job of keeping everything clean up there as well!
If you're just going up to Pine Grove to hike or explore, it's awesome and there's a ton of trails that are good for both walking and biking. I love to bring my dog here to explore the hidden paths throughout the gorgeous forests and swim in the creek. So peaceful. Easily some of the most beautiful scenery Pennsylvania has to offer. Breath-taking!