What cultural faux pas should I try to avoid making in Vik?

"In Vik, it's considered rude to not remove your shoes when entering someone's home. Always remember to respect the natural environment, as Icelanders take great pride in their country's beauty. Don't litter or disturb wildlife. Avoid discussing whaling, as it's a controversial topic in Iceland. Also, refrain from comparing Iceland to other Scandinavian countries, as Icelanders are proud of their unique culture and heritage. It's considered impolite to refuse food or drink offered by your host. Even if you're not hungry or thirsty, it's better to accept and not finish than to decline. Don't be too loud or boisterous in public places, as Icelanders tend to be reserved and value their peace and quiet. Avoid being overly familiar or touchy-feely with people you've just met. Icelanders are generally reserved and value their personal space. Lastly, tipping is not customary in Iceland, so don't feel obligated to leave extra money at restaurants or for services," remarked another expat in Iceland.