each wall has a season label, and they run to the right wall when it is called out
4 season labels
stick a season on each wall, 1 summer, 1 spring, 1 autumn, 1 winter.
Call out a season and the Beavers have to run to the correctly labelled wall.
Once they get the hang of this then change it to a decription rather the season, eg " when do leaves fall off the trees", " when is it snowy" etc.
Carry on until you run out of ideas, or they are worn out.