Well, they aren't homeschoolers, but I appreciate that Jack and Annie of the Magic Tree House series almost never mention school during their adventures. They read, research, take notes, follow their instincts, meet and talk to interesting people, etc. All outside of school -- just for fun!
Warning: the first few books of the series have *horrendous* sentence structure -- fragments galore! They get a lot better a little way into the series; parents and teachers must have complained! They aren't great literature, but they're fun and can provide ideas for further study of history or geography.