Hi, I'm heading to Dublin in May but will be staying outside of Dublin for 4 days before returning to the city centre. I plan to purchase a 3-day Freedom Pass for when I stay in the city centre but apparently you can only buy it at the airport. If I purchase it when I arrive at Dublin airport, leave for 4 days, and then use it on the 5th day, would it still be valid for 72 hours? (ie, do I need to purchase it on the day I plan to use it or could I purchase it ahead of time?)
Also, do you recommend driving or taking the bus when staying in the city centre? How's the parking there (rates & ease of access)?