Woohoo!
Are you sure about the no kayaking?
As for twisting, etc, when you get to a certain point in bone healing, it is important that you DO subject the healing bone to various forces. That's because bone growth is in response the forces the bone experiences.
It's quite amazing, really. Bones have these complex, arches, etc inside them, to handle the forces they have received, but they do not lay down extra bone where it's not needed (where it would handle forces they have NOT received).
So, if you rest a healing bone TOO much, it will be forever weak.
I am NOT saying you are doing that, and you should definitely do what your doctor says. But you might bring up the subject with him/her, and ask at what point you ought to do what stuff. Maybe doc is saying you should make sure the stress on your healing bone is in a controlled setting, e.g. physical therapy exercises?