The semi-mature, mixed woodland at Newcastle Woods extends to both sides of the River Inny. The forest is unique in that it has a diverse range of tree species of different age structures that includes oak, ash, beech, pine, and Norway and sitka spruce, with lesser quantities of birch, willow, hazel, alder, cherry, and holly. This mix of species and associated canopy layers, combined with the network of meandering forest roads and pathways, creates an ideal walking experience.

Newcastle Wood was once part of Newcastle Demesne, an estate of some 11,000 ha run by the King-Harman family in the 1800s. Nearby Newcastle House was where the King-Harmans lived and there are many features and place names in the woodland which refer back to that time.

Coillte, in association with Newcastle Walkways Development Group, has been developing and enhancing the trails since 2001. There are 28km of walkway throughout the forest, most of which comprises gently undulating forest roads and trails, allowing for easy progress through the changing forest.

Spot birds like swans, mallard, teel, wigeon, kingfisher, skylarks, and many others as you wander, along with the odd mink. Fallow deer can also frequently be seen flitting away through the trees.