If you're searching for alternate phrases to describe a "mystery tour", there are plenty of imaginative options to choose from! Some possible synonyms might include "adventure excursion", "surprise trip", "unplanned journey", "unexpected voyage", "expedition of discovery", or even simply "mystery adventure". Whatever phrase you prefer, the basic concept remains the same: embarking on a journey or trip without knowing exactly where you will end up, or what sights and experiences you may encounter along the way. Whether you're planning a surprise birthday trip for a friend or simply craving a little excitement and spontaneity, a mystery tour can be an amazing and unforgettable experience to share with loved ones!