Ferry trips from Dunquin Pier/Cé Dhún Chaoin to The Great Blasket Island/An Blascaod Mór daily at 10:05am/11:05am/12:05pm and 1:05pm. A quick 20 minute crossing and 3.5 hrs on the island.
Ferry to Knightstowns take about 10 minutes to cross and runs continuously from morning to evening. Check timetables to make sure you know the first/last ferry. It runs about 10 EUR a trip but you can get a multi-trip pass which is generally worth it – you can easily hand off unused trips to someone in the family.