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We had an *Island night* where the men wore "hawian" shirts and we had a party on the deck - everyone were given garlands to wear (my husband and his friend wore a hat with dreadlocks which they bought in Antigua.
There were no themed nights on our trip last Jun.
There aren't usually themed nights, but you will have formal nights. Before you travel, you will receive lots of details through the post from Princess detailing how many formal nights there will be, so you will know what to pack.