In this day and age of terrorist bombings, etc, I find it hard to believe that if you show up at the port of Dublin or at an Irish airport and they don't require you to show them your passport regardless as to whether you are a British citizen or not.
I'd be rather surprised if you were simply able to show some other British document.
I haven't been over there post 9/11, but last trip about 6 years ago I wasn't asked for
any identification, nevermind a passport. As I drove off the ferry an immigration officer just wandered up to the car window and the conversation went something like this:
Officer: "Good morning Sir. Are you British?"
Me: "Yes."
Officer: "O.K., t'ru you go, enjoy your stay."
Me: "Thank you."
And that was that!
(And I was in a Ford LTD station wagon, so I didn't exactly "blend in" with most of the other travelers.)
Maybe they've tightened things up a little since then, but according to the Oasis government site British citizens still don't require a passport, just as Irish citizens don't need one to come to the U.K. (That's when traveling directly between the U.K. and RoI -- You need a passport if arriving from some other country.)
I guess if the requirements didn't tighten up during the height of the I.R.A. terrorist attacks in the 1970s they figure we're not going to let a few Middle Eastern terrorists affect us now. Besides, there are lots of places on the NI/RoI land border to slip across unnoticed anyway if you really wanted to.
So I understand there aren't any massive population areas like London and I hear there is a smaller town feel in many parts of Ireland. Please correct me if I'm wrong about this!
I'd go along with that. There are only a handful of cities large enough to have their own Borough Corporations -- Dublin, Cork, Galway, Limerick, and Waterford, maybe one or two more. There's certainly a small-town/rural feel to much of the country.
I've not been down to Cork/Kerry or the other farthest southern counties, but I've traveled all across the midlands area, over to Clare and Galway, and up to Sligo, Mayo, Leitrim, and Cavan, and it really does have that small-town relaxed feel.
Certainly in the hilly, rural areas of Leitrim and Cavan it's very relaxed and friendly, people will just stop in the middle of the road to chat through their car windows, for example.