hand in: meaning and explanation
When you hand something in, you give something to someone who is an official or in a position of authority. If you find a wallet in the street, you would hand it in to the police. When a student finishes their work at school, they hand it in to their teacher.
This phrasal verb can be used when you decide to leave your job – you hand in your notice. In this case, you give your resignation letter to your boss or manager.
Have a go at these micro-dictation exercises to hear this expression being used in context – how much can you understand?
Accent: North America
About the sentence
…Before leaving the hotel…
Notice the structure before doing sth. With before/after, we can use a noun, a gerund or a clause. e.g. Before lunch/before eating lunch/before I eat lunch.