You may be required to use a credit card if you want to use any of the extra services in the hotel. Go to bed early and wake with enough time to fully prepare. Never check it with your luggage, or fold it over, or store it in the overhead bin. Food is always a covered expense when you are with the company representatives. However, most other meals, including breakfast and dinner, are usually on your own.
Many hotels offer a continental breakfast included with the room.
Always make sure you have eaten before your interview. You will need the extra energy for what can sometimes be a grueling schedule. Know where and when you will be meeting with the employer. Get accurate directions and a map if you need assistance. If you are arriving the night before, an excellent psych-up activity is to drive by the company location and visualize your interview the following day.