A bus from the airport is a pretty economical way to get into central Dublin. In all the reading I did, I hadn't learned about the 10 euro Dublin family bus pass. The bus options from the Dublin airport that one commonly hears about are the express Airlink bus for 6 euros/person or the regular city bus for about 2 euros. But for a family, there is a better, more economical option. The Family bus pass gives your family of 2 adults and 2 kids unlimited rides on Dublin buses for one day, including the express bus to/from the airport. The express bus takes about 45 minutes to central Dublin. We later took a regular (many stops) bus from Dublin out to the airport and it took closer to an hour. There wasn't bad traffic, just lots of stops.