Your guide will pick you up at your Phnom Penh hotel in a tuk tuk and take you through the bustling city to the Mekong River boat pier. As your sunset cruise begins on the 12th-longest river in the world, admire the blaze of colors on the water in the late afternoon sun.     Your vessel provides an amazing view of Diamond Island before you arrive at a historic fishing village built on the river. On board the boat, the staff ensures your comfort as you enjoy beverages from the open bar under the setting sun. Your experience ends when you disembark at the boat pier.