The Portrunny Heritage Trail is a cycling/walking trail where you can discover our heritage and biodiversity which includes the medieval sites of Galey Bay and Castle, Inchcleraun Island, St. Diarmaid's Holy Well and Portrunny Church and Graveyard. The biodiveristy sign is located beside the picnic area which displays the flora and fauna of the area.

The harbour area of Portrunny is the central meeting point of the heritage trail. Adjacent to where the harbour lies, An Bothár Mór which leads to St. Dairmaid's Holy Well can be found along with Portrunny Church and Graveyard. As you leave Portrunny Bay heading towards Roscommon, you will notice a sign for Shannon View School on the right-hand side, and further on, a sign for Galey Castle and Bay to the left. Continuing towards Roscommon, you will come across Cloonsellan Abbey on the right and here you will have the opportunity to join the Kilteevan Heritage Trail.