You might enjoy finding shells and sea glass on the beach but what about Lego?
Well in Cornwall you could find some.
In 1997 a goods container filled with millions of Lego pieces fell off a ship and into the sea.
Since then hundreds of pieces have washed up on the beaches of Cornwall.
Ayshah went to a beach in Cornwall to meet some local kids who have discovered Lego there.
Although it's fun to find the Lego bits washed up on the beaches in Cornwall it's also good for the environment.
The plastic pieces do not break down so stay around for years.
The pieces can be harmful to wildlife like seagulls so taking them away is a good idea.
But it's not just Lego that causes problems.
Watch this guide on how to help keep beaches clean.