This is the 16242nd most frequent Polish word.
urlopowych
"Urlopowych" means "of vacation" or "relating to leave/holiday."
Here, 'urlopowych' serves as an adjective describing 'trips' (wyjazdów), indicating that these trips are related to vacation or holiday time.
W czasie urlopowych wyjazdów, odpoczywam najlepiej.
During holiday trips, I rest the best.
'Urlopowych' modifies 'activities' (aktywności), specifying that these activities pertain to the vacation period.
Plany urlopowych aktywności są już gotowe.
The plans for holiday activities are already prepared.
In this sentence, 'urlopowych' is an adjective describing 'days' (dni), highlighting that those days belong to a vacation.