Seljalandsfoss. That waterfall. As far as natural phenomena go, it’s pretty great, and it is definitely deserving of its status as one of Iceland’s premier tourist attractions. If you are a tourist, you should go see it. It’s beautiful, it’s close to Reykjavík, it lies in the path of many other interesting things to experience: other waterfalls, the Hvolsvöllur Saga Museum (with its excellent Co-op museum, Njála museum, etc.); it’s on the way to Vík í Mýrdal. And you’ll want to go to Vík anyway.
To get there from Reykjavík, you simply drive (or hitchhike) down Miklabraut until you reach the off-ramp marked Vík. Turn there. Then drive that way, past Hveragerði, past Selfoss, keep looking left: you’ll eventually see it. Get out of your car. Walk up to it. Marvel at nature’s wonder. Think about why we bother building all that boring, ugly stuff we build. Walk up the path, go behind the waterfall. Revel in the spraying water. Affirm life, once again.
Feels good, don’t it?