Summer's just about over - and William wants to end it by having the BEST DAY EVER! But can a buttoned-up, Type-A kid let loose and embrace a day filled with free-range fun?

It's the last day of summer vacation and William - a little boy who loves order and schedules - has just one thing left to accomplish: have the most fun ever. He's even created a fun-o-meter to help him achieve his goals. But nothing he does seems special enough. Even worse, William's fanciful next-door neighbour, Anna, keeps interrupting his plans with increasingly outlandish suggestions - like trampoline bouncing to the moon to find dinosaur bones or riding talking seahorses to an underwater castle. Can these two seemingly different kids find a way to have the best day together...and maybe become friends, too?

This charming picture book about a child who always follow the rules is a must-read for kids and parents in need of a funny, gentle reminder to get creative and let their imaginations run wild.