Look for an accommodation close to this path!
The unique feature of Seljalandsfoss is the trail (and the cave) behind it, so that the visitor can walk all around it and take wonderful pictures. By the way, we suggest the visitors to lower they expectation. Bright blues sky and sun are quite uncommon in Iceland, so if you are not a good photographer you'll probably see Seljalandsfoss the same way we did:
None of these picture is probably unforgettable, but it seems a travel to Iceland can't miss this place!