There are lots of great sites out there. Here are a few.
Middle Creek Bible Conference, Inc. is a Christian organization currently constructing a new Bible Conference Center near Gettysburg, PA. Also on the site is Middle Creek Manor, a beautiful Civil War era house which serves groups of up to 30 for retreats & seminars.
Christian Camping International. You can view their Member Directory
to find Christian camps in your area.
Bible search tools for several translations. This is on the Tim Greenwood Ministries site.
Campus Crusade for Christ
Tim Greenwood Ministries. This site includes devotionals, testimonies, opportunities to serve, Bible search tools, & more.
Mount St. Mary's College & Seminary This site has info about the school, and about The Knott Athletic Recreation Convocation Complex (ARCC)
Appalachian Trail For more information, you can also see the Appalachian Trail Conference website.
Chesapeake & Ohio Canal
Cunningham Falls State Park
Gambrill State Park
Gathland State Park
Greenbrier State Park
South Mountain State Park
Washington Monument State Park