1. Can I arrange one day trip to nikko from Tokyo?Short answer, yes. It's a 2 1/2 to 3 hour train ride on a Tobu Line Rapid train. If you use the World Heritage Pass (3,600 yen), you'll save quite a bit of money.
http://www.japan-guide.com/e/e2358_002.html
Of course, if money is no object, you can take a shinkansen from Tokyo Station and get there in about 2 hours for 5630 yen. Same for the return trip.
2. Where should I go, what is the most attracktive. I am actually interested to go to "World Herritage". Can you advise the ticket cost.
See this site:
http://www.japan-guide.com/e/e3800.html
or here:
http://wikitravel.org/en/Nikko
or here:
http://www.jnto.go.jp/eng/indepth/featuredarticles/worl...
3. Can you pls advise how to go there from Tokyo.
It all depends on where you are staying in Tokyo. If you could reply with where you plan on staying, we might be able to help you a bit more.
Can't reply by email as you did not supply it in your post.