Taking advantage for the RT non-stop from Miami to London for only $400 this May (had $1200 voucher on Delta so we are going for free). Using hotel points to stay at Crown Plaza near Buckingham Palace for 5 days and looking into fun things to do in Dublin. This will be my 4th time and my DP first time in London. Anyone have any suggestions on things to do in Ireland? We are going to rent car for 4 days (no car in London).