If you are getting a rental car in Iceland you should definitely consider driving the golden circle. It’s one of those day trips that are so much greater on you own at your own pace. Here is what you should consider.
The Blue Lagoon is a short drive from Reykjavik but you might hang out there for a big part of the day so don’t plan to drive any longer trips te same day you go there.
Geysir and Gullfoss are places you see the same day. When you drive to Gullfoss, you actually pass Geysir. The drive there is a very scenic one if you chose the route going north of the lake Thnigvallavatn. Pack some lunch with you or enjoy the refreshments offered along the road to Gullfoss and Geysir.
On route, there are two places you should check out. First one being Thingvalla national park. Walk between the teuctonic plates and see the crystal clear water in Silfra & Peningagjáinn, a fissue where legend has it your dreams will come true if you throw a coin there.
The second stop would be in the village of Laugarvatn. There is a great little spa there with geothermal heat. After Laugarvatn, you have maybe 20 minutes to Geysir.