Ten Things is a series from Pretty & Fun's intern, Emily of Em La Jolie, that was started to give you ten pieces of advice each month - from travel to lifestyle to food. If you didn't catch her previous posts, check them out! // image via kate spade new york Summer is meant for exploring, and while taking a plane or train to your next destination is perfectly acceptable, there's nothing quite like setting out in your car for a highway adventure. From cross-country to weekend getaway, I've compiled a list of things you must…