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You may not have heard of South Korea's second largest city (pop. over 3.5 million), but Busan (about two hours 45 minutes by sleek train from Seoul) happens to be a cool metropolis where you can enjoy a mix of exciting and laid back. Big-city attractions and amenities sit alongside historic landmarks, museums, and other cultural offerings, and greats beaches/ecotourism nearby. When you arrive, take a daylong bus tour to get yourself oriented, then go back and check out these highlights.