If you want to quickly learn travel Japanese it's worth trying out the 10-dollar Japanese language course from Sulantra.
Sulantra focuses on "Survival Language Training" so that you learn the right travel Japanese phrases and vocabulary to get yourself out of difficult situations while traveling in Japan. If you're planning to go to Japan you should do the Japanese course 30 days before you are due to leave. That way all the important Japanese words and phrases will be fresh in your mind when you arrive.
It's very convenient to be able to just log in any time to the Sulantra Japanese course and start studying. Although I've lived in Japan for a long time I've been going through the course because there are so many gaps in my Japanese vocabulary such as medical terms or the necessary phrases to rent a car.