Cubs take directions to do an activity over the phone, then they carry out the instructions
Obstacles (chairs, tables etc)
2 x Mobile phones
Layout some obstacles around the hut
write several sets of instructions on how these obstacles can be traversed
In turn give one phone to a cub and call them from the second phone.
Dictate a set of instructions to the cub. They would repeat them to you to ensure they understod them.
The cub follows the instructions.