The Retired Kid - Jon Agee
What a fun book. A boy decides that being a kid is hard work and he is tired. In fact, he's ready to retire. His parents throw him a retirement party and then he actually flies to Florida to live in a Retirement Community. At first the retired life is great, but soon he grows tired of some of the down sides, like looking at hundreds of snapshots of someone's grandchildren and prune juice smoothies. So he comes out of retirement and goes back to being a kid.
The illustrations are fun and clear - a mix of crayon drawings with watercolor coloring. The look is simple, I wouldn't say it looks like a kid could do it - but there is a child-like sensibility to Agee's illustrations.