Firstly,apologies if this should be in another section or has been discussed before. 1:Is a U.K passport necessary to gain admittance to the Republic of Ireland from U.K via ferry from Holyhead. If not,what other forms of identification are acceptable? 2:The journeys I wish to make are Dublin to Midleton & return;and Dublin to Antrim & return;both as day returns. Is there a 2-day rail rover which would cover these trips or should I purchase day returns? I also wish to spend a few hours (maybe a day) in Dublin doing the line between M3 Parkway & Docklands as well as the LUAS network. Is there a ticket which covers this or,again,should I purchase singles/returns? Many thanks in advance for helpful answers.