The attitude toward punctuality is more casual in Iceland than in other parts of Europe. You will be forgiven for lateness. Even if you never needed it.
When you are offered Hakarl, DO NOT EAT IT. Funny-Fun-Ha-Ha foreign food is best left for the dolts on Globe Trekker; this stuff is shark meat that has been buried and left to putrefy for up to six minths. 1) Bury. 2) One of these. 3) Eat.
"No Takk Fyrir" is your apt response.
Try instead Skyr. I'm sure there's fish that hasnt been rotting for 180 days in that white, gurty goodness somewhere.
Do not critize the weather. And don't neglect your takk fyrir's when applicable.
Notices of Freddie Mercury: Zanzibar
This Beautiful Isle:
Begat this Beautiful, Beautiful Man: