we used to buy sodium chlorate , mix it half and half with sugar. Put it in a metal cigar tube, screw the cap on, puncture a hole and it made a rocket. It now has a flame inhibitor in .
At school we put dry ice in the sink in chemistry lab and dripped water on it to fill the room with a white cloud.
I made a firework once with twenty bangers, home made fuse and lost all my eyebrows.
Now you cannot go in the school play ground if it is raining. No making slippy curries.
This was in the day before all the adverts about compensation claims.
My youngest grandchildren have Forest School every Friday where all the activities take place in the woods that belong to the school - rain or shine they spend the day outdoors.