We are staying overnight in Dublin for a couple nights in March. We do not have a rental car and want to get to Belfast for a tour of Belfast and the Antrim Coast (just Giant's Causeway & Rope Bridge). What options do we have to get back and forth between Belfast and Dublin? Any suggestions for a tour including Belfast and Antrim Coast? Paddy Campbell's Black Taxi looked interesting. Are there tours leaving from Dublin to Belfast and Antrim Coast? Thank you for your input!