Name
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Drop-first decision
Guide / live check
What changed: check-in, lunch, or another booking has taken the middle out of the day.
Drop first: the outer-city stop and its return journey.
Keep: one line through the compact centre with one warm stop that can become the main activity.
Check before leaving: the closing time of that warm stop, not the opening time you missed.
Reykjavík plans usually go wrong by keeping too much, not by starting with too little. When wind, rain, a late check-in, or tired legs cut the usable day, protect one good main activity and remove the part that creates the most movement.
This is a drop-first list: seven common situations, the piece I would remove, and the part I would keep. Check the live weather, opening hours, and transport before leaving.