How long is the ferry trip?
Is it worth the trip, or should I look at flights?
From Dublin you can take a flight with Aer Arann http://www.aerarann.com/ It takes about 40 minutes. It's not the cheapest and whether to go there or not depends on what you want to see/do. There are some great tourist things, It's not fast pasted but the locals are friendly. almost 8 years ago