Drive out the R335 (Louisburgh Road) along the coast. Pass through Murrisk (note the car park at the start of the Croagh Patrick climb on the left, and the dramatic famine memorial opposite). Just over a kilometre past Murrisk turn right (signposted Bertra Beach). This winding road brings you to a car park at the beach.
From the car park descend the steps or rocks down onto the beach. Turn right and, keeping Clew Bay and the islands on your left hand side, walk along the sandy beach. Follow the coastline right around the spit at the end and make your return journey on the slightly stonier terrain at the Murrisk side.