The Cliffs of Moher are entirely vertical and the cliff edge is abrupt. On a clear day, the views are tremendous, with the Aran Islands etched on the waters of Galway Bay. From the cliff edge, you can just hear the booming far below as the waves crash and gnaw at the soft shale and sandstone.

With a due-west exposure, sunset is the best time to visit.

As these are some of the most popular cliffs in Ireland I want to suggest you actually explore them via the "Cliffs of Moher Liscannor Walk". It's 3 Euros at the parking lot and you will avoid the crowds at the main car park while you can enjoy the walk at the coast line most likely with a way smaller amount of people. Also here I recommend arriving in the late evening, this place is an amazing sunset location.