Eidfjord is a village, with a population of under 1000. So you'll probably be restricted to visiting the local tourist sites. They include the V�rinfossen waterfall
http://www.voringfossen.com/
the national park visitors' centre
http://www.hardangervidda.org/hne.htm
and the power plant which is built into the mountain.
Akureyri is the second largest town in Iceland but, by UK standards, it's still small. (Population = 17,200. About the size of a small market town in the UK). You can find out what it has to offer, here:
http://visitakureyri.is/en
Chris