With over 3.6 million people, Busan is South Korea's second largest city and largest seaport. Busan is known for its beaches, hot springs, nature reserves and events such as the city's renowned international film festival held each fall. Busan is a good destination for those seeking a more laid back atmosphere than Seoul. Located at the southern tip of the Korean peninsula, Busan's important port gives the city an international flair, with sailors from around the world trooping through and a growing number of tourists. (Busan Wikitravel)