This was my third Contiki, and until now I absolutely loved them. This particular tour has some teething problems with far too much free time, serious lack of inclusions and mediocre and expensive extras.
Skip the Hiroshima cruise. Not worth the money - terrible food and doesn’t include drinks. Book yourself into a Teppenyaki instead.
Also, don’t book the ski extension with Contiki - it doesn’t include lift passes, hire or lessons. Best booking the transport and better centrally located accommodation yourself.
This is definitely not a party trip. You’ll go out every second night to a small bar but it doesn’t really attract a group of party animals.
I’m sure there were some people that thought this trip was fantastic. Maybe it was a me problem. But if I were to give advice: Save yourself the huge sum of money and book it yourself.