Vietnam is an astonishing mix of natural highlights and cultural diversity. The scenery ranges from jagged peaks seen from winding mountain passes down to verdant paddy fields painted every shade of green in the palette, while Vietnam's long history and multicultural population (with over 50 ethnic minority groups) make a trip here rich in heritage. Outdoor lovers can get their teeth into the countryside within the numerous national parks, where hiking, biking, and kayaking are popular things to do, but Vietnam's most famous natural tourist attraction, the spectacular karst seascape of Halong Bay, is one natural sight that even the more slothful can experience up close on a cruise.