Great question, I was also laughing...., and, yes, I am a mum, too.
The suggestions are good, I specifically like the idea of goal setting.
At the end of each class, get your group to discuss for 5 min which specific goal they would like to attack in the next class. This also gives you some time to prepare.
I have once used a session with warm water. Organised big washing bowls (are you in a public hospital), filled them up with warm water and did exercises in there. For the children's class, I added a drop of food colouring. Got a bit messy, but was fun anyhow.
The cooking class thing is also nice, it could led to sharing the food after the class (if you have got some space available for this) and finally give them time to do the chatting...
Have you got an OT in your team? They have also really good functional "toys and games".
Cheers,
Fyzzio