The term "down trip" usually refers to a journey that involves descending or traveling in a downward direction. It could also mean a trip that is depressing or unfavorable. Accordingly, antonyms for this term would include "up trip", "ascension", or "elevation", as they refer to journeys that involve going up or climbing. Other antonyms for "down trip" could include "pleasant journey", "positive experience", "exciting adventure", or "amusing excursion", as they connote trips that are enjoyable, stimulating, or full of fun. Thus, instead of looking at things negatively, we can explore positive and uplifting synonyms or antonyms for a better and more fulfilling journey.