there is also a company called something like Faherty that offers a one day inclusive tour from the bus station.(which is up near the tourist office.) Usually I prefer to make my own arrangements, but this tour impressed me as cost effective and very convenient. However, the day I wanted to go it was sold out, so I bought a ticket from the agency that runs the ferries and took the bus that departs near the VIctoria Hotel as others suggested. That was fine, but I would just observe that the inclusive tour does away with the need to buy separate tickets for each part of the day and gives you the option once you arrive of taking a van ride or renting a bike (or walking), all things you would want to do anyway but it seemed just a tad easier and did not seem to cost more than the way the rest of us did it, piece by piece. If you go on your own you will see that there are bus/van operators waiting for each ferry arrival and there are also bike rentals right there. However you get there, you will find Inishmoor a magical place, well worth the trip. You might read the Yeats poem before hand, though I did not see bean rows growing nor hear bees.