Steve Jones welcomes the last three teams to the final of the competition in Vietnam for the harshest environment and toughest terrain yet. The three teams have to combat Vietnam's chaotic streets, navigate the remote backwaters and sample the exotic cuisine. In the first challenge the teams have to build the local version of a rickshaw and race across the city. The second task sees them sourcing the strangest ingredients from the local markets. If they pay attention to what they buy they may earn a good night's rest - if they recognise their purchases in a taste test. Will Streetwise ever get to spend a night in luxury accommodation?