Dublin is a very pedestrian friendly city. It is crowded by comparison to the rest of the county but , the people are lovely. There is so much to see and do that one would hardly find time in five weeks to take it all in.
Photographically, everywhere along the river seems like an opportunity - especially at sun rise.
Dublin is also the hub of the train system for the country. It seems that one can travel almost anywhere in Ireland by train from Dublin.