When we went to Angkor Wat after our Mariner Cruise in 2007, we stored our extra large bags at the Bangkok airport--we had been on the Mariner for PANDA too, for a total of 26 nights. I realize you will be going from Singapore, but you might not want to worry about the luggage and just store it at the airport--assuming, of course, that you're returning to Singapore.
We just did this in Paris, too, so we wouldn't have to schlep luggage on the train after LION. Was more expensive in France, but well worth it.
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Eugene