Yes usual US flat sockets. We have sets you buy in Argos with both types in anyway just in case.
This RCI ship this month had 2 US flat ones and 2 European round ones. Spoilt for choice.
Can't help with towels as was so cold and wet when we were on April last year we never saw anyone in there.
1968 S.S. Nevasa Baltic
1970 S.S. Nevasa Western Mediterranean
2008 Island escape Western Mediterranean
2009 Legend of the Seas Eastern Med and Aegean
2009 Island Escape Canaries
2010 Thomson Dream Western Mediterranean
2011 Thomson Spirit Red Sea Magic
2011 Star Princess Adriatic and Aegean
2012 Thomson Majesty Adriatic
2013 Thomson Dream Western Med