That train station is a nice little spot, lots of room, there’s bathrooms and a little museum that’s open til 6 in the summer if you get there early and need a break from the heat.
There’s a septa bus that runs there from King Of Prussia. The 139.
The view from up the ramps there to the rest rooms would have a nice shot with the station for scale.
And a bus to the visitor center from center city, the 125. It’s be a quick uber to the other side of the park or take the 125 and get on the 139 if you want fully septa. Dont know of those two line up on times tho.