We hope you are enjoying your stay. This is a reminder that check-out is by [time] on [date].
Before leaving, please: 1. Return the key to [actual return location]. 2. Turn off [equipment requested by the property]. 3. Follow the property's instructions for [trash/dishes, if applicable].
Once you have left, please send us a short message. Thank you.
Good morning. This is a friendly reminder that check-out is by [time] today. Please return the key to [location] and message us after you leave. Thank you for staying with us.