Rail sail vs fly

6 adults traveling, flying from the states in and out of London, tickets already purchased. Would like a few days in London and then go to Ireland, rent a car then proceed to Scotland, rent a car then back to London a day or two prior to flying out of London back to states. Questions, wanting to see Dublin, cliffs of Moher and dingle, ring of Kerry. Don't know if we should fly into Dublin see Dublin then obtain car and go to do the other than fly out of Shannon to Scotland or the reverse. Where would we drop off the car if we ended up Shannon first and Dublin last. Any comments would be appreciated. Going may of 2013. Or would you recommend rail/sail. Prefer to not use too much time traveling in between. Thanks

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