Arrive at Keflavik International Airport and take the Flybus shuttle to Reykjavik city centre; takes about 45 minutes and costs around ISK 3,500 per person.
Stay at the centrally located 3-star Fosshótel Reykjavik, offering comfortable double rooms with modern amenities, costing approximately ISK 28,000 per night.
Visit Hallgrímskirkja Church and take the elevator up for panoramic views, then explore Laugavegur shopping street; walking is the best way to explore central Reykjavik, which is compact and free.
Collect rental car from budget providers in Reykjavik; typical cost for 2 people approx ISK 12,000 per day including insurance. This gives flexibility for Golden Circle and beyond.
Drive to Þingvellir National Park (free entry), Geysir hot springs area and Gullfoss waterfall; parking fees approx ISK 750-1500 at major stops. Plan 7 hours for the loop including photo stops.
Depart Reykjavik driving east to Seljalandsfoss (free entry) and adjacent Gljúfrabúi waterfall (hidden gem). Wear hiking shoes for behind-the-falls walk.