Make a wax cooker and cook a s'more using it. (probably over 2 evenings).
small tin per cub, corrigated cardboard, wax granules or candles, something to melt wax in and heat source, scissors, wicks, marshmallows, skewers, chocolate digestives.
Clean tin (preferably a ring pull tin so there are no sharp edges). Cut strip of cardboard to fit snugly inside, and coil tightly to fill the tin. Place a wick, or a strip of cardboard vertically in the centre. Fill the tin with melted wax (use a double boiler to safely melt) and leave to cool.
Make s'smores using 2 chocolate digestives and a marshmallow each. Do this outside.