I'm just going to put this out there. Iceland is ridiculously beautiful. There's been a rise in tourism there and a ton of hype. Over these past 5 years, you couldn't go on Facebook without seeing one of your friends sharing photos of Iceland.
If you're coming in from North America, you'll most likely land super early in the morning as we did. Pick up your rental car at the airport and head into the city. You'll be tempted to take a nap but try your best to stay up.
Reykjavik is a vibrant and artsy city that has much to offer. Spend the day to get to know the capital. I recommend orienting yourself by taking a free city walking tour with CityWalk.
Every Iceland itinerary is going to have the famed Golden Circle. Despite this route being heavy on tourists, you can't miss the trio of Geysir, Gullfoss, and Thingvellir National Park.
Weather permitting, I personally feel that the 4th day around Snaefellsnes offers the most stunning of landscapes. You'll be driving along the coast and making many stops along the way.
On this day, you'll be leaving Snaefellsnes and dropping down to the south. Watch the landscape dramatically change as you make your way along this popular route.
Continue the drive along the south and feast your eyes on unique basalt columns, gorgeous canyons, and rugged plains. Luckily there isn't too much driving until you make that final stretch to Skaftafell National Park.