We were just on a 12 day Oceania cruise...at the Dun Laoghaire stop, we walked from tender to the DART train...with my bad knees it took under 10 min. Took the train into city...got a round trup ticket at the vending machine.....about half hour....we walked to the HOHO bus....we had also booked the Guinness Storehouse Tour. Had great excursions in Belfast, Portland, Kirkwall, Liverpool, Holyhead.