Queenstown and Christchurch, or just Queenstown?

We will have 6 days (including embarkation day) in NZ before embarking on cruise from Auckland, and we are planning to fly to Queenstown. Cruise has a port stop in Akaroa. We are 2 adults and 2 twentysomethings who enjoy hiking, biking, walking, kayaking, and outdoor activity.

Do you think it's worth the trip to Christchurch (and then flight from Christchurch to Auckland one day before embarkation) in this short amount of time? We would not rent a car, but rather would take a one day bus tour via Mt. Cook:

https://www.awesomenz.com/choose-your-awesome-destination/mt-cook/mt-cook-aoraki-queenstown-christchurch/

Alternatively, we could just stay in Queenstown and then fly to Auckland from there.

Alternatively, we could just stay in Queenstown and then fly to Auckland from there.

I know that would mean missing Mount Cook and some of the inland scenery, but I think that you'd be left with less time in Queenstown than you'd like.

If you don't do this tour, then you could have:-

Day 1 Queenstown incl evening

Day 2 Queenstown incl evening

Day 3 Queenstown incl evening

Day 4 Queenstown incl evening

Day 5 Queenstown until afternoon or evening flight to Auckland

Day 6 Embarkation day

If you do the tour, you would have something like:-

Day 1 Queenstown incl evening

Day 2 Queenstown incl evening

Day 3 Queenstown incl evening

Day 4 All day tour plus evening in Christchurch

Day 5 Christchurch until afternoon or evening flight to Auckland

Day 6 Embarkation day

Given that you would have the chance to go to Christchurch from your Akaroa port call anyway, in your shoes I would not cut down that much on the Queenstown time. The activities that you're interested in are perfect for spending time in Queenstown for, but there is really rather less of that sort of thing in Christchurch.

Thank you for your input. We're staying in Queenstown!