So "a trip" is something between "a walk" and "a journey".
We say "go for a walk" "go for a trip", but we say "go on a journey" "go on holiday" "go on an excursion".
As far as I remember we say" go on a school trip''. If I'm mistaken, correct me.
Thank you for another collocation! If I was supposed to fill in a preposition (in an English test) to "go ____ a journey", maybe I wouldn't know whether ON or FOR is correct. Now, I willl know! ;-) (If I manage to keep it in my mind.)
So "a trip" is something between "a walk" and "a journey".
We say "go for a walk" "go for a trip", but we say "go on a journey" "go on holiday" "go on an excursion".
As far as I remember we say" go on a school trip''. If I'm mistaken, correct me.