Guide in general
http://www.kek.jp/intra-e/access/ http://www.kek.jp/RSO/eng/
From Narita airport to Tsukuba center
http://www.kek.jp/RSO/guide/transportation/narita_jikokuhyo.html
From Tsukuba center to KEK
http://www.kek.jp/RSO/documents/KEK_Center.pdf (see the upper box, green and white)
From Tokyo to Tsukuba center / Tsukuba station
by Highway bus (recommended for the first visitors) http://www.kek.jp/intra-e/access/timetable2.html by train http://www.kek.jp/intra-e/access/timetable4.html (use upper box, "Tsukuba Express") Railway map (Click an image for a larger view.)
Please get to the Tsukuba Center as the general guide in the above, then take a taxi to the hotel. The cost is around 3,000 yen. The following will help you. (Click an image for a larger view.)