Kai and Jarra were joined by mum and dad Sorrell and Steve and about 30 other people who spent several hours cleaning up the beachfront areas at Byron Bay.
Sorrell Millis said it was very important that children learnt to care for their environment.
Cape Byron Trust site co-ordinator Andy Robinson said he was very pleased with the turn-up.
“This is the 10th year we have participated in the clean-up,” Mr Robinson said.
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