Planning Options

Booked on Vietnam etc. on Jan 21, 2013. Day 9 "optional cruise...of Tonle Sap Lake". Does "optional" imply it costs extra, or you give up some other activity, or what? When staying at China Beach is there time to go to the beach? Is there any scheduled free time on this itinerary? When? Is it possible, if space is available, to switch to an earlier Dec. 2012 departure after paying deposit? Thanks.
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