Take a bus!!!
Look for a KEISEI high way bus counter to get a ticket to Tokyo. The bus will take you to the Yaesu exit of the Tokyo Station, Sukiyabashi (Ginza), or Oedo Onsen Monogatari (an Onsen spa facility in Tokyo Bay area.) The transportation fee is only 900 yen per person each way.
Please note that if you are arriving at the airport late at night and need to take a bus after 10pm, please go directory to the bus terminal and wait in line.