Jökulsárlón is a good place for photography and also pretty amazing spot to see the icebergs. Jökulsárlón is actually a glacial lake of Vatnajökull (the biggest glacier in Iceland) where you can photograph icebergs slowly floating through the channel to the sea. Here the icebergs are usually thrown on the black beach which gives a spectacular contrast.
Tips – the icebergs are transparent (a bit) and are difficult to photograph if the sky is pale and there is a lot of light. Try to pick periods with some clouds or more blue sky 🙂 I know it is difficult in Iceland. I was there in the evening and there was no light at all and I have pretty bad photos…maybe next time.
Bring also the tripod!