Keflavik Airport to Reykjavik City Centre by Minivan

Probably not. Reykjavík's centre is small enough to walk end to end in twenty minutes, and Hallgrímskirkja, Harpa, the Old Harbour and Laugavegur are all on the way. A short driven tour (/experience/1194803/) makes sense if you have limited mobility, a few hours between a flight and a tour, or want the outer sights like Perlan and Grótta without a bus. Otherwise, walk, and spend the money on a food walk.

One full day for the city itself, plus however many days you use it as a base for tours. Most people spend the first and last nights here and take day trips to the Golden Circle, the South Coast and the sea. Three to four nights in Reykjavík with three day tours is a sensible first Iceland trip. Longer than that, move on; the country is the point.

A column of light on Viðey island, just off Reykjavík, dedicated by Yoko Ono to John Lennon. It is lit each year from 9 October, Lennon's birthday, to 8 December, the date he died, plus a few other dates including New Year. Elding runs an evening ferry and walk to the tower (/experience/1301/) during the lighting season. Outside those dates the island is still worth an hour for the walk and Richard Serra's sculptures.

For a quiet two hours, yes. The ferry (/experience/1539/) takes twenty minutes from the Old Harbour in summer and five from Skarfabakki all year. There is a cafe in the old house, a small church, walking paths and views back across the city. Nothing on it is dramatic, and it is exposed to wind, so pick a calm day. It suits a spare afternoon better than a planned one.