>>59 Wheel in the sky keeps on burning~ But yeah, what >>59 said is right. A journey is of importance, a trip is just kinda going somewhere. The heroic party journeyed to the castle of the evil overlord. The group of friends took a trip to the arcade.
>>60 Also, I forgot to mention. Journey can be a verb, but trip means something else as a verb. Something akin to stumbling. Like, "I tripped on the computer's power cable and fell on my face".