Jökulsárlón Lagoon

From Reykjavik, just head south on Hwy 1 for about 3 hours until you reach Jokulsarlon. It's just off both sides of the road and a bridge drives over it - you wont miss it. If facing east, the lake is on the left side of the road and Diamond Beach is on the right. Both are awesome spots to shoot some photos. 

This is by far one of the most amazing places I have ever seen and is a must see if you are in Iceland. You could definitely camp on the beach in the soft black sand to get some photos of the northern lights if the wind isn't too harsh. It's also an amazing spot to catch the sunrise or sunset. You can combine the drive out here with a lot of other things too and make a good day trip. 

Check out my other adventure, "Waterfalls of Iceland" for some more ideas.