I read this as a child and don't remember anything about it, other than I loved it. I need to find it and read it again.

ETA: I found a copy through www.betterworld.com and read it in a couple days. I remember why I loved the story - lots of do-goodism in the "understanding others" category, a quirky protagonist, a homemade roller coaster, and WWII homefront life. Plus, as a kid I loved eating lemons. ( )