Japan Travel Tips
Japan Customs:
http://www.customs.go.jp/english/summary/passenger.htm
U.S. Customs:
http://www.cbp.gov/travel/us-citizens/CBP-declaration-form-6059B
Japan Tax-Free Guide (8% Sale Tax Exemption from 10/01/2014):
http://tax-freeshop.jnto.go.jp/eng/index.php