Destination
Osaka
Osaka works especially well as a lively final base: food, nightlife and easy access to nearby day trips without another hotel change.
Best first question
Stay, or use it as a base?
Osaka can be the destination itself or a practical base for nearby regional day trips.
大阪Good starting point
2–4 nights
Enough for Osaka itself, with more nights if you want to add day trips without moving hotels.