Port to centre
Shuttles, taxis, and organised coaches bridge the port and the centre. Time varies with traffic — morning peak can sting.
Once in the core, walking between Trinity, the river, and nearby museums is straightforward if you keep the list short.
How far is too far?
Powerscourt and Wicklow can fit longer calls. Cliffs-of-Moher-scale fantasies usually do not. Choose depth over distance.