Far less classic, but rather entertaining in its own way, is Rip Foster in Ride the Gray Planet, and yes, it's exactly the sort of boy's adventure novel science fiction you think it is. The tone is well-established by chapter names like "Rake That Radiation!", "Duck -- or Die!", and "Ride the Planet!". (No, the chapters don't all have exclamation points, but a lot do.) Just for additional Carolingian amusement, it is billed as "A Golden Griffon Space Adventure".
Finally, I find myself on the horns of a dilemma even mentioning it, but they've also done up one of the great Masonic Exposures. I can't quite bring myself to link to it -- strictly speaking, even mentioning it is out of bounds, but my practical-ritual-interest side is warring with my Masonic loyalty here -- but those who want to seek it out can find it. I'll say this: it's not entirely accurate, at least to modern ritual, but it certainly has plenty of spoilers. I would definitely say that anyone who is even remotely interested in ever joining should not read it: the ritual is meant to be experienced, rather than read. (Especially not read in such dreadful run-on prose as this book...)