General:
* ταξίδι (taxídi): This is the most common Greek word for "journey" or "trip." You could use it with an adjective to describe the adventure: "μακρύ ταξίδι" (makrý taxídi - long journey), "περιπετειώδες ταξίδι" (peripeteiódes taxídi - adventurous journey), "εξερευνητικό ταξίδι" (exereunitiko taxídi - exploratory journey).
* odysseia (odýsseia): This is the word for "Odyssey," the famous epic poem about Odysseus's long and adventurous journey home. It can be used to refer to any long and challenging journey.
More specific:
* εξερεύνηση (exereúnisī): This means "exploration" and emphasizes the discovery aspect of the trip.
* περιπέτεια (peripéteia): This means "adventure" and implies excitement and risk.
To create a more descriptive phrase, you can combine these words with adjectives:
* εξερευνητική περιπέτεια (exereunitiki peripéteia): exploratory adventure
* μακρύ και περιπετειώδες ταξίδι (makrý kai peripeteiódes taxídi): long and adventurous journey
The best word to use will depend on the specific context and the type of adventure you want to describe.