A single day in Osaka is enough to see the "highlights," but it barely scratches the surface of the city's vibrant culture. If you only have 24 hours, you can visit Osaka Castle in the morning, explore the trendy Amerikamura or Shinsaibashi for shopping in the afternoon, and end your night in the neon-lit Dotonbori for the famous "street food" experience (takoyaki and okonomiyaki). However, this schedule would mean missing out on Universal Studios Japan, the world-class Osaka Aquarium Kaiyukan, or a deep dive into the "retro-future" vibe of Shinsekai. Because Osaka is known as "Japan's Kitchen," most travelers find that at least two to three days are necessary to truly appreciate the culinary scene and the uniquely friendly, outgoing personality of the locals compared to the more reserved Tokyo.