Kate stayed on the Viking Tonle for seven days, ending her trip in Siem Reap - (Viking) I’m on Evergreen Island, close to the town of Tan Chau, in Vietnam’s Mekong Delta, on day two of a Mekong River cruise, when I meet a chatty farmer who offers me rice wine whiskey, a stool to sit on, and plenty of local insight, as chickens peck at my feet.