A lump of cheese

In the summer we would go to Barry Island,
even people from England went there, 
there was a holiday camp you see, 
apparently they filmed hi-de-hi there in off-season,
this was before the days of gavin and Stacey ,
another sitcom to make barry famous, 
we would go down to the beach and eat gritty icecream and sandwiches,
washed down with warm orange squash,
drying ourselves on a sandy beach towel 
before going on the dodgems. 
one day my dad bought me a bucket and spade, 
he made a masterpiece of a sandcastle 
but he wouldn't let me near it,
so I threw a lump of cheese at one of the towers,
destroying the castle, 
and my dad said,
that's not very mature is it ??