In the past if I've had a mixed group etc and don't want all of the activities available all of the time, I've created shelves that I can close. I hinged two small shelves together (wheels on the bottom optional depending on how easily they can be moved). The back side of the shelf can be set up with a mounted felt board, chalk board or posters to "pretty it up" if wanted. It's great to hide away activities that you don't want used at certain times!