Okinawa last week of November?

Hi. I'm from Sweden and are traveling in Japan from November 12 until December 2.

The only thing planned is Sumo event i Fukuoka the 23rd.

Now. Should I go to Okinawa for some 5 days before or after that?

I really want to see the most of the autumn leaves in Japan as well. Are they still there in last week of November?