Nikko has many beautiful place to offer but one of the most important spot must be "Nikko sannai" area, where you can see a temple, Futaarasan-jinnja, and two shrines, Tosho-gu and Rinnou-ji (including the part of Taiyuin-reibyo).
The buildings with red green and golden decorations in Tosho-gu and Taiyuin-reibyo are beautiful and very impressive.
Indeed, Nikko is a very popular touristic place and you could see many visiters from abroad.
Official website of Nikko tourist Asssociation: http://www.nikko-jp.org/index.shtml
