Tulips,

A taxi is always easier as it will take you right where you want to go. Once you arrive at your hotel you can have the porter take charge of your luggage.

I can't tell you which pass would work best for you. It depends on your needs. This is the link to the Rambler: http://www.dublinpass.ie/dublinpass/transport/rambler.asp

This is the link for the Freedom Pass, which includes the hopper bus, airlink and nightlink buses: http://www.dublinpass.ie/dublinpass/transport/rambler.asp

You will have to decide which services will be most important to you.

Michele