Martin gets up-close and personal with Vietnamese nature preservation by joining an eco-riverboat tour. Much to his delight, in addition to all the tips on nature, Martin also learns about the charming life of local fishing families, and how one can 'rock the boat' on an eco-river cruise. Recipes: Banana Blossom Salad with Duck and Ginger, Grilled Spicy Lemongrass Lambchops.