Glendalough is in the Wicklow National Park which is situated south of Dublin on 20,000 hectares of mountain scenery with many roads crossing through it. A lot of the National Park has no facilities and is left mostly untouched and natural.
Glendalough has many way marked trails/routes from easy to difficult. The Visitor Centre in Glendalough sells a Trail Guide for only €0.50. The maps list nine way marked routes with the shortest distance being a few kilometres and the longest 11 kilometres. You can park at the Visitor Centre and start your walk from there (parking free on weekdays, charges apply for weekends) or there are parking facilities at the Upper Lake with charges applying all year round. The Visitor Centre is approx. 2km from the Upper Lake which can be accessed by walking on the pedestrian and scenic Green Road. Toilet facilities and food are available from the parking area at the Visitor Centre and at the Upper Lake.