For beautiful scenery and a memorable journey, skip the flight from Vietnam's Ho Chi Minh City to Cambodia and take the boat instead. The mighty Mekong River connects Cambodia, Laos, Myanmar, Thailand, Vietnam and China and is the longest river in the South East Asia region. This journey will take you through the bustling villages of Vietnam's Mekong Delta, stopping at delta towns like Chau Doc and Cai Be before crossing the Vietnamese and Cambodian border for the five-hour cruise to Phnom Penh, Cambodia's capital. From here, another boat travels to Siem Reap's impressive Angkor Wat temple complex. A slower, but more satisfying way to cross borders.