By Vidja Rajan, Columnist, The Times ChesLen Preserve, Coatesville – A Shady Trail for Hot Summer Days Round trip distance: About 3 miles round trip in the shade, can be extended to around 5 miles. Difficulty: Easy to moderate (one steep path going down) Caution: Closed for hunting on occasion during deer season. Heed posted signs. Website:  http://www.natlands.org/preserves-to-visit/list-of-preserves/cheslen-preserve/ Trail...