Several suggestions if you are concerned and dont want to make your visit too obvious:
1. Never give your real phone numbers - swap the last 2 digits around (unless they are the same!)
2. Use address but with a bogus number when booking - one that doesnt exist. Not too hard to establish.
3. When you arrive, ask how long it is to xxxx hospital where you plan to visit an ill relative. When you leave, say relative taken turn for worse, and you may not be back. Solves checkout and fire alarm issues.
4. OR when you leave post punt, take card with you and say you've an urgent business matter to attend with or whatever, and what time are the outside doors locked as you may be late back.
The card makes a reasonable ice scraper too.