Travel means 'travelling in general'. it is normally uncountable. My interests are music and travel. The plural form travels is sometimes used for a long tour in which several places are visited. Did you meet anybody interesting on your travels? "Travels with a Donkey" (book by R L Stevenson) A journey (mainly British English) is one 'piece' of travelling. Did you have a good journey? A trip is a return journey together with the activity which is the reason for the journey. I'm going on a business trip next week.
Compare: 'How was your journey?' 'The train broke down.' 'How was your trip?' 'Successful'
We do not so often use trip for expeditions which have a very serious purpose, are very hard and/or take a very long time. Amundsen made his journey to the South Pole in 1911.