If you do Harrisburg come across the river to Cumberland County. We have some awesome restaurants and fun things to do. You can visit the old iron furnaces at Pine Grove State Park, where there are trails from beginner to advanced for hiking and biking; swimming in two lakes in summer, picnic areas with charcoal grills, fishing, boat rentals, and campsites. If you search Pine Grove Furnace State Park on the PA DCNR website there is information. Very close to Pine Grove Furnace is a lovely old mansion and environmental education center with hiking trails named Kings Gap. It is an absolutely beautiful place. Paulus Farm Market is a fun place to pet and feed farm animals. It is a bit kid centered, but it has a small yet wonderful farm market! Meadowbrook Gourds is in Cumberland County, where you can come and find some beautifully decorated gourds for every holiday and season. If it's the right time and day, you can even sign up to make your own personalized gourd. Information is available at: https://meadowbrooke-gourds-retail.myshopify.com/ You can always look up the tons of things to do just across the river from Harrisburg at: https://www.visitcumberlandvalley.com/ You could certainly fill three to four days here. And it is about two and a half hours from Philadelphia, depending upon traffic on the turnpike. I hope this was helpful.