Euro dollars and a few american dollars in small denominations. just make sure you dont bookyour excursions with the cruise line. it is much cheaper to walk out of the port and get a taxi check the price first they will usually take you where the ships tour goes and make sure you have the name of the dock in the local language barter barter barte.
If you give us a clue as to what countries you are visiting then we may be able to help..
Depends on what parts of the world you are going t.
Sorry Hong Kong,Phillipines,Borneo,Singapore,Vietnam and Chin.