The Alternative Route:

From Brennanstown Road turn into Brennanstown Vale. Follow the road around until you reach a turning circle in the road. Park around here. Just past the turning place there is a small trackway that leads to a gate. Walk down here and turn left after the gate - this is a disused railway line. Walk along the well-worn footpath until it crosses the river. Make you way down to the river bank (either climb down the 2m tall wall or carry on for a while along the railway track until you find a place where you feel comfortable making the descent). Carry on in the same direction for a few hundred metres. Eventually you will see that the trees on both banks open up and the capstone of the tomb should be visible on the far bank. Ford the river with great care here and you are at the tomb.

Please be very, very careful if following these directions. This is still not an easy route, but it is nicer than scrambling down the steep bank from the houses above.