Day 1: Osaka Castle, Kaiyukan and Umeda
- Morning
- Visit Osaka Castle Main Tower (opens 9:00, ¥1,200) and walk the free castle park.
- Afternoon
- Ride the Osaka Metro Chuo Line from Tanimachi Yonchome to Osakako for Kaiyukan aquarium (allow about 2 hours).
- Evening
- Head to Umeda for the Umeda Sky Building observatory at night (open until 22:30). The Osaka Station City prayer room is open until 18:00 if you arrive early.
- Getting around
- The Chuo Line links the castle area and Kaiyukan directly.