If this is your first time outside Tokyo, why would you go to Osaka? It's like a mini-Tokyo, without most of Tokyo's attractions. What are you planning on doing there? Far better to spend the three days in Kyoto. Nara is certainly worthwhile but with only three days, I would just stay in Kyoto.
Hi,
I have booked a Cathay Pacifc flight DUB-HKG-NRT but coming back I fly from KIX -HKG-DUB as the cheaper fares from TYO were resulting in a overnight stay in Taipei so Osaka is handy for the last few days.
Planning on visiting Osaka Castle , the gardens, shirnes, observation decks and the main sights in Osaka. As I have HH Diamond status I was planning on staying at the Conrad or Hilton in Osaka. If we were coming back next year we would probably spend time in Kyoto.
Regards
TBS