as far as i know dubrovnik is the real only must see in croatia. the complete coastline of croatia is very beautiful but april is still off season. so it might be that many hotels,restaurants etc are still closed at the coastal region.but in the bigger cities like dubrovnik and split and due to easter holidays in the beginning of april chances are quite good,that you are not the only tourists over there.
i traveled only once with ou-but no problems or any specials.wouldn't worry to much
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