Placeへ VNに [ 行きます/来ます/かえります ]
Action-nouns can be used without the direct object to express the purpose of going/coming/returning. Typical words include: 見学(study tour; field trip), さんぽ(walk; stroll), 買い物(shopping).
工場へ 見学に 行きます。 We take a study tour of the factory.