If you're planning a seaside holiday at any point this year, you may want to have a look at RSPB First Book of the Seashore book for kids. It's currently reduced to £3.82 at Wordery, with free UK delivery.
We have a whole set of these books, and over Easter we broke out the First Book of Seashore. It's like having a treasure hunt that goes on for days, weeks, months - however long it takes you to complete it.
The book contains pictures that are familiar to - in this case - the seashore with information about each item you're likely to find on the UK shoreline. Each identifier image has information on what it is too - like what type of shell, or seaweed. At the back there's also a checklist where you can check off what you've found.
It's just a bit of fun, and something to keep them busy and squabble free in the car. We write down which town we're in when we spot each thing too, which should make for a nice memento of childhood holidays down the line.