In Dublin your boys would probably like Dublinia, a museum of of Viking and Medieval Dublin. If you can get out to the monastery at Glendalough it is well worth the trip.

There is unfortunately not a lot to do with teenagers in Galway. It is a college town so there are a ridiculous number of good bars and clubs (I recommend the Quays) but underage children are not allowed in them.

I found the people in Ireland were on the whole ridiculously friendly. Coming from the states it took me a few days to get used to that,

Send me a PM if you want some good places to eat in Dublin and Galway.

Enjoy!