Heading down to PA this weekend with the fam to visit my wifes relatives. Staying in Gilbertsville, PA...and wanted to see if anyone has been to Valley Forge, PA and ifs a good site to see? (Going to go to the Phili Zoo probably on Fri/Sat, and were looking for another close trip to our stay) Anyone been there? (Traveling with mom in law, my wife, and my three boys ages 7 (civil war fan), 5 and 3. Thanks.