Battleship New Jersey should top your list of fun things to do in Philadelphia. Known as America’s most-decorated battleship, Battleship NJ served in active duty from World War II until the 1980’s. Now a floating museum for New Jersey and Philadelphia residents and visitors to enjoy, add this attraction to your must-see list. Offering group tours and even overnight stays, Battleship NJ provides a lot of options for fun things to do in Philadelphia.