Elliðaárdalur valley is in Reykjavík. It is easily accessible and you can either walk or bike there for hours. It is beautiful and quite and it´s like you are far away from the buzz in the city. Trees, birds, rabbits, river, flowers. Many walking paths and you can actually get “lost” in Reykjavík for a little while. A great option for an adventurous morning or afternoon away from the busy city life.