Trexler Nature Preserve comprises 1,495 acres of natural preserve and is the largest park in Lehigh County. The park is open every day of the year, sunrise to sunset. The hills offer spectacular views of the Lehigh Valley. Marked Trail Miles: 10.5  Day Use Parking Areas are located on Game Preserve Rd., Orchard Rd. and Old Packhouse Rd. Horse Camping: Read more...