Pay 3100 yen for the Airport Limo a free Tokyo Metro tourist pass for the day. It's worth your time money as you'll be able to ride as far or as long as you want. Just remember it's valid for ONE day. Get it at the booth @ ticket counter once you arrive at the airport and ask for the FREE TOKYO METRO TOURIST 1 DAY PASS .

Always have money! it's very expensive in japan, specially in the main cities, like shibuya and shinjuku

Bring plenty of money to spend!

Tokyo is a huge city. Make sure you plan your itinery based on subway routes which will save you time a great deal!!!

AMAZING Shops, Food, People, Asakusa Temple, Sushi Bars, Tokyo Youth Hostel, Imperial Palace, Tokyo Tower, Kimonos! Everyone should go at least once!

Be sure to give yourself plenty of time when leaving Tokyo for the Narita International Airport. It may take longer than you think.

Always have a pocket subway/rail map handy. It saves a lot of time knowing exactly what trains you need to use.

Also, if you're going to be there for a couple weeks, I'd highly recommend purchasing a JR rail pass. It may seem expensive, but it'll pay for itself, especially if you are going to be riding the Shinkansen.

Glaubenscenter in Myjota Sushi is a must try!!!

If you travel to Japan note that it is not easy to find ATM's that will take normal Visa or Master Card cards. Therefore make sure you have enough cash with you. Bigger train stations and Hotels will take your cards, but in smaller travel stations you might need to pay with cash.

Check out the Shibuya district. You can watch the famous crossing from Starbucks or another coffe shop around the crossing, from above it looks pretty amazing. There are also cool shops around there, even just to see the hip dressed Shibuya teens. Ueno park is a must, especially in spring. Also I recommend a trip on the Shinkansen bullet train. If you travel south from Tokyo to Nagoya or Kyoto, make sure you sit on the right hand side of the carriage for breathtaking views of Mt. Fuji. On top of all Japanese people are the friendliest and most helpful I've ever experienced.