help using a samsung note 10.1 in Japan

I'm going to Japan for the first time in April / May this year, I already have all the scripts and I only have one important question:
I'm taking my samsung note 10.1 a samsung cell 3, the question is:
which chip should I buy when I arrive in Kyoto and use the internet, eg to use the internet when I'm on the streets and I want to see a map on the internet, or I want to facebook...my trip is end of April until May 16. thank you very much

rent a mifi device such as this one:

http://www.globaladvancedcomm.com/pocketwifi.html

thank you for the attention and the tip :-)