Best picture locations in Chester/Montgomery counties PA?

In 2 weeks we are doing my son's 1st birthday photos. I would really like a nice spot to take the pictures. I was hoping to do them a little further into October because of the changing leaves and fall colors but my photographer can't. So I need to decide where I'm going to do these now because she needs to do them next weekend. So does anyone know of any nice places for pictures in PA? We live near St. Peter's Village but I can't exactly take my 10.5 month old climbing on the rocks there yet... We don't mind driving a little bit because the pics will be worth it! We're hoping for something outdoors and fun but I'd love some suggestions on this!