noun
day trip
A trip that is completed within a single day, without an overnight stay.
週末に日帰り旅行で温泉に行った。
I went on a day trip to a hot spring over the weekend.
日帰り is a more general term meaning 'day return' and can be used as a noun or adverb (e.g., 日帰りで行く). 日帰り旅行 specifically refers to a day trip as a travel event.
Compound of 日帰り (day return) + 旅行 (travel).