"Grown-upness is truly wasted on grown-ups"

If you can go with the far-fetched premise of Cosmic by Frank Cottrell Boyce, you'll probably appreciate the book. Liam is twelve, but because of his height and a bit of early facial hair, he's often mistaken for an adult.  When he wins a vacation package to what he thinks is an amusement part, he pretends to be a dad and takes his friend Florida along as his daughter.  They end up in China, where the other prize-winning kids and one adult will train for a ride on an actual rocket ship!  Liam ends up going aboard, and all is well until there's an "oops" and the rocket is seemingly stuck in outer space.  Fortunately, Liam's skills obtained from hours of playing World of Warcraft save the day.  The story was originally published in Great Britain, and the British words and references may be confusing to some readers in the U.S., but the kids' humor, the general idiocy of the other fathers, and Liam's likable character make this a fun read.