I've been to both now (the other being Giants Causeway) - I have to say that this was more epic in my opinion (but both are great). There are a number of different tour operators that go out from Oban, Tobermory, Fionnport and Iona. A number were already closed for the season, but I'm sure one of them probably gives a long stop on the island during summer - but I dont know which one for sure.