Do you get to choose what character to be when you jump in the book, or is that magically random? If "yes", then any book where I can have superpowers because that'd be, like, fun.
If the answer is "it's randomly chosen for you", then scratch that and instead, any book that doesn't involve evil wizards/leaders/dasterdly plans, Ultimate Evil (the Ring! oh noes!), or world or galatic wars of a fantastical or even 'normal' nature, etc.
Hmm....I don't read many books without such things in them. Perhaps Asimov's Robot novel series.