Sorry Leeneia, but I have to question a couple of your points, most of which are quite sensible.

First, I don't think sunburn is a real danger in Dublin.

Second, in my extensive travels in Ireland in recent years, pub owners and B & B owners in rural areas are good sources of information about their areas, but local tourist offices are usually good too. Yes, rural pub and B & B owners know where there are local sessions, but are also likely to steer you to the ones of the people/pubs they like (or are related to), which won't necessarily be the best music, but often can be.

As to traditional music in Dublin, the hotel keepers and the tourist offices usually aren't knowledgeable about the music at all, and will most likely steer you to the really dreadful "tourist sessions"--not what you are looking for if you are trying to get a real sense of the trad music life in Dublin.