Chris and I have been to Longwood several times and it is absolutely beautiful!! It's nearby, and you can get tickets online ahead of time. They do have timing restrictions because of COVID, so we suggest buying tickets a week or two before you'd like to go once we know what the weather will be like. Definitely a must-do!!
Kelly Drive is a park and road that runs along the Schuylkill River, home of the Dad Vail Regatta. (Adrianna raced many times down that river during her college rowing career!) Kelly drive is also the location of the well-known "Boathouse Row", a stretch of the river with some beautiful college rowing boathouses! Kelly Drive is a great place for a walk or a run if you want to spend a day visiting the city! (FUN FACT: at the end of Kelly Drive is the Philadelphia Art Museum, home of the iconic steps climbed by the "Italian Stallion" - better known as Rocky Balboa. You can even take a picture next to his statue!)
The Philadelphia Flower Show is going to be right after our wedding this year! It runs from June 5-13. Details about hours and tickets are on the website. Also, there is a train that runs straight from Thorndale (near Chris's parents' house) into the Convention Center if you don't want to deal with city parking!
Valley Forge is a great place for a little bit of fresh air and history. There are lots of trails and bike paths, and it's close enough to the King of Prussia mall to go grab a bite to eat or do a little bit of shopping!