No you do not need any converter or adapter - you can use your US appliances on the PG. But that said there is only one plug so what I usually bring is a surge strip so I can use my makeup mirror, cellphone charger, Camera Battery charger and hair dryer. An extension cord might also be helpful.

VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami