Hello! My friend and I (university-aged) are traveling to Ireland for three days this July (28-31). We'll be staying in Galway for a day and a half, and Dublin for another day. We want to dedicate one day entirely to Galway's arts festival (29), but we're a little lost what to do before our evening train tickets to Dublin on the second day (30). The same rule applies for the 31; we don't have any specific plans for that day.
For Galway, we'd like to know if there are any shortish (5ish hours or shorter), scenic tours recommended. For Dublin, we haven't really found anything that fits our tastes, so general recommendations work.
(Additionally, if anyone knows, is the "10kg check-in bag" for Aer Lingus a carry on bag? Our ticket specifically says no checked bag so we can't really imagine it being anything else).
Thanks!