America’s first urban refuge was established in 1972 to protect Tinicum Marsh, the largest remaining freshwater tidal wetland in Pennsylvania. Flat trails take you through the refuge’s 1,000 acres of woods, marsh, ponds, and meadows that serve as a pit-stop for migratory birds headed south for the winter. During high tide you can explore the refuge via canoe or kayak.

It’ll be tough to explore the 10,500-acre park in one trip, so visit often. But explore beyond the Forbidden Drive, which is often heavily trafficked by runners and cyclists. Snap a shot at the Thomas Mill Road Covered Bridge. It was built in 1737 and is the only remaining covered bridge in the Wissahickon.

There are almost 20 miles of trails to explore in this national state park, the site where George Washington and his army shivered their way through winter during the Revolutionary War. Prefer biking over hiking? You can bring your own wheels or rent a bike for $15 from the Valley Forge Bike Rental shop.

For an escape to the mountains, head north to the Bushkill region of the Poconos.The Pocono Environmental Education Center is located within the Delaware Water Gap National Recreational Area and offers six hiking trails to choose from that include multiple stops at waterfalls and sweeping views of the mountainside along the ridge.