books about traveling:
hitchiker’s guide to the galaxy is very fun, but the actual hitchiker’s guide is the first book in a series of five and pretty short, so I would recommend the ultimate hitchiker’s guide to the galaxy, which is a collection of all five.
passenger by alexandra bracken is pretty decent too, but be warned: sequel doesn’t come out until next year.
the hobbit is a classic and is very much about adventure.
books that have to do with traveling:
the knife of never letting go by patrick ness (first book in a trilogy)
paper towns by john green
the poisonwood bible by barbara kingsolver (not YA but amazing read)
the glass castle by jeanette walls (also not YA but fantastic)
hope this is helpful!