Dublin is very much a victim of its own success and as the Celtic Tiger roars, it's drowned out by the sound of all those extra vehicles on the roads. But with a bit of forward planning it doesn't have to be that bad. Location of your accommodation can take the headache out of travelling around Dublin - a city centre location puts you in the heart of the action, and only a short distance from coast, or countyside. Various commuter tickets are available, with the best value being Rambler and Family Tickets.
Car hire is an option but remember that the city is becoming very, very anti car.
Parking is expensive and limited and there is traffic congestion most of the day. Currently there is free parking in these spaces on Sundays, but that may change so check with Dublin Corporation first. Walking is the perfect way to see the city up close and personal and it is very hard to get lost with even the most basic map. Cycling, particularly in traffic is not for the fainthearted and unfortunately, as with all major cities there is crime, if you hire or buy a bike invest in a good strong lock.