Some 200 resident bottlenose dolphins frolic in the Shannon Estuary; they're best encountered on Dolphinwatch's two-hour cruises, on which you might also see minke and fin whales in autumn. Sailings depend on tides and weather conditions. Boats depart from Carrigaholt's Castle Pier; it's best to park by Dolphinwatch's booking office a few hundred yards away, as accessing the pier itself by car is tricky.

Dolphinwatch also runs Loop Head sunset cruises and geology tours.