Where to find interpreter companions?

[DaveG]

I'm off to Tokyo in two weeks and I'd like to be able to find someone to tag along to help me out in some of the funkier places. I'd rather not go alone to a place like Alcatraz ER for example. Anyone have any idea what would be a good place to look? I wouldn't need someone with great English, just someone who's willing to take the time and work it out with me.

Thanks!