This is a great beach activity. Stone towers can be made using any kind of rocks, pebbles or stones. Stack them in any shape want and as high as you like (as long as you stay safe).
Mind your toes and always dismantle your tower when done – but make sure you snap a pic of it first.
If you’re building your tower out of beach pebbles, remember that it’s illegal to remove materials from UK beaches (sand, pebbles, shells etc.)