Mentioned by Ireland 10 days itinerary
10 Days in Ireland: The Perfect Irish Road Trip Itinerary
"Dún Aonghasa on Inis MorInis Mor The easiest way to get to Inis Mor is by taking a ferry from Ros a' Mhíl/Rossaveal, which is located about 50 minutes from Galway. You can either drive yourself to Rossaveal, or take advantage of the shuttle bus that leaves from central Galway about 1.5 hours before sailing in the morning."