The Dublin Mountains Way is a surprisingly nice trail that passes along the Dublin mountains with regular expansive views across the city. I say surprising in that some of the trail and the areas it passes through are not what you might expect from a trail on the edge of a city. Passing through places the "The Scalp" you feel like you are a million miles from Dublin City.
Wild camping is not permitted on the trail. There are lots of good accommodation options near the halfway point of the trail for anyone interested in hiking over two days. It is straight forward to get a taxi/get collected from Zipit, at the halfway point. I highly recommend this trail for anyone that has not done a long-distance trail before.
Cycling is not permitted on the Dublin Mountains Way.
For groups larger than 30, and for commercially guided walks, a permit is required from Coillte.