Who this suits
Anyone planning their first Iceland trip
Averages 120–240 km of driving daily — comfortable without feeling rushed, with medium weather slack if one day turns bad.
The buffer day
Where to actually spend it
Put your spare day wherever your interests point hardest — an extra night in the Southeast for a guided glacier hike, or a full day around Mývatn instead of the compact version.
What's still tight
Snæfellsnes stays a stretch
Ten days can just about fit a short Snæfellsnes detour if you cut something else — the 14-day plan is the one built around it properly.