Skogafoss

Skógafoss is one of the biggest waterfalls in Iceland, with a drop of 60 meters and a width of 25 meters, and you can walk right up to, but be prepared to be drenched. It is just overwhelming standing next to it.

Seeing that it produces a lot of drizzle then you will be able to see beautiful rainbows on sunny days. And, Yes - There are a lot of tourists.