That “entertaining trip” is giving me the vibe that the book is for kids. Math is not fun per se and people should not pretend that it is! If you like math, you like it and then it is fun for you – no need to try and cheat you into it with this “fun” stuff. 
But to be fair, I am pretty sure I can brush up 4th - 12th grade of math in a week (even bought some used local math teaching books several months ago). I am more interested in actual applicable math. But I’ll need a really good guide. That’s the tricky part.