You might look up "The Great Swamp" in central New Jersey (practically in EBarnacle's back yard) for birding. If you wait until Spring (May is great) you can rent a kayak or canoe at a place near us called Bucks River Country and paddle the Delaware from the Frenchtown (NJ) Uhlersberg (PA) bridge to Pt. Pleasant. You'll get some very nice views of the palisades as well as the vultures that live on them. I always found flying an open-cockpit plane on east-west routes in the state to be interesting, as from about 2000 feet above the ground the state resembles nothing more than a sheet of corrugated cardboard with ridge after ridge and valleys in between. The valleys are generally full of farms, with a little airport at the bottom of each. Often, the decision whether to go on was made based on whether the next ridge was visible in the haze that seems to form on most days. Once I made the wrong decision and nearly JFK Jr'd myself. The area around Blue Mountain, north and west of Allentown can provide some great vistas. And of course, here in Bucks County, we have Ringing Rocks and Stover State Parks, both famous for their geologic features. Gettysburg can be informative as to how terrain affected that major Civil War battle. The battlefield itself is best seen on horseback.