Your Stamina !
I guess, the stamina is very important to make you in reaching this place ! Your passion is seeing this amazing place is enough to make you reach here ! Walking shoes would be okay but just wear anything, even stillettos if you want ! Just be there !Oh, make sure you have warm jacket available, you never know when the weather would get colder & colder or it might rain when you are there ! As the most areas around Iceland, consider this place as pretty remote !Bring ample stuffs so that you won't get in any personal problems... Definitely a must ! Only if you want to sleep here...

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