Trip is a countable noun and can be used in the singular with 'a' or in the plural.
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Both refer to actually going to another location in order to relax and have fun. It can be another city, town, country, etc. However, 'trip' is a noun and it is the act of moving to a different place temporarily in order to have fun.'Travel' is a verb that signifies going on a journey.
Noun. an event in which schoolchildren travel to a location separate from their normal learning environment under the authority of the staff of their school and with the purpose of learning by experience.