1. RENT A WIRELESS ROUTER "POCKET WIFI"
In Japan , it is difficult to get a prepaid sim card unlike other Asian countries. To get connected to the internet while in Japan is a must especially for first time travelers. One can find it essential to have this device specifically for train navigation , restaurant finds , places and tourist spots ,GPS and to update social networking sites in an instant.
The pocket wifi allows multiple gadgets to connect at once using unlimited data.
One can choose to rent the device from any of the company counter offering at the airport. However , booking online before your departure to Japan may cost you less and more convenient as you may choose to have the device delivered at your hotel and includes an envelop for return.
PUPURU wifi service for example offers 400 JPY/day . Please check their website for more information.