extended, long
brief, little, quick, short
day, overnight, weekend, week-long
We went on a day trip to the beach.

four-day, two-week, etc.
frequent, occasional, rare, regular
He makes frequent trips to Poland.

annual, weekly, etc.
forthcoming (esp. BrE), upcoming (esp. AmE)
fantastic, good, great, nice, pleasant
safe
Well, have a safe trip back!

successful, worthwhile
The food alone made the trip worthwhile.

memorable
dream
her dream trip to New Zealand

uneventful
The rest of our trip was uneventful.

special
Don't make a special trip just to get my newspaper.

free
The first prize is a free trip to New York.

return, round
From São Paulo to Rio and back is a round trip of five hundred miles.

foreign, overseas
round-the-world, world (both esp. BrE)
European, Korean, etc.
away (BrE,sports)
In their last two away trips, Everton were defeated by Spurs.

boat, bus, coach (BrE), train, etc.
bicycle, bike (informal), cycle (BrE)
road
He set off on a road trip from Rhode Island to California.

business, camping, fishing, golf, hunting, pleasure, shopping, sightseeing, etc.
school
a school trip to Washington, DC

field
a geography field trip to study a limestone landscape
a field trip to the Science Museum (AmE)

family
study

be (away) on, do, go on, make, take
She's away on a business trip.
From here visitors can take a boat trip along the coast.

have
Did you have a good trip?

come back from, return from
be back from
He's just back from a trip to Alaska.

complete
They are hoping to complete the trip in four days.

arrange, organize, plan
book
cancel
extend
cut short
I had to cut short my trip when my wallet was stolen.

enjoy
Enjoy your trip!

survive

on trip
My wife is away on a business trip.

trip by
a five-minute trip by taxi

trip to
a trip to Tokyo

a trip abroad (esp. BrE)
My last trip abroad was two years ago.

the trip home
The trip home took us five hours!

the trip of a lifetime
They saved for years for their trip of a lifetime to Hawaii.