In folklore this cave was the entrance to Tir Na Og. I know that every time I head to Lough Gur I feel like ive been there hours but when I look at my watch im only there for like an hour.
This cave can be found by following the path past Bolin island to the gate the separates Knockadoon which is on private property. Just before the gate on the left you can spot a few paths follow them up and you should be able to find it. Careful though the stones are very slippy.