What not to do in Iceland?

I have mentioned some of the things which you can't do in Iceland. Just check these out:
1. Don't Take Pictures of Everything
2. Don't Leave a Tip
3. Don't Talk About Politics
4. Don't Complain About the Local Food
5. Don't Be Loud and Obnoxious
6. Don't Enter a Sauna or Pool Without Showering First
7. Don't Make a Big Deal Out of Local Customs

A few days ago I had visited this country with my hubby. I really enjoyed my trip with discover.is.