You should def book, it looks awesome!
Not sure if there is anything else to do instead of the sports academy, but looks like we will be doing other activities during the day anyway. You should be able to still participate, just not run It won't take up the whole day anyway so all good. There may be others that don't want to do it so sure you can sit out and watch if you like.
We are leaving from Aukland. Really excited
If you end up booking, feel free to join the Facebook group I made.....it's a closed group for people on this tour