We have 5 college kids going to Ireland in september, 4 girls and 1 boy. (we're all studying architecture but intend on having fun too). We plan on spending the bulk of our time in Dublin. But we were also planning on seeing Galway, Cork, and Killarney. We can spend one night in two of these cities and two nights in the remaining city. Which city would be the most worthy of spending 2 nights in????