To say "going out for a trip" in Engpsh, you can say "going on a trip" or "going on vacation." For example:
"I'm going on a trip to the beach next week."
"We're going on vacation to Europe in the summer."
Note that "trip" can refer to a short journey or excursion, while "vacation" typically refers to a longer period of time spent away from home, usually for leisure or relaxation.