Call for Ideas: Tokyo Scavenger Hunt

In April, our 8th graders will be going to Japan for a class trip/cultural tour. One of the days, they'll be immersing themselves in Japanese language and culture through a scavenger hunt in Tokyo. Of course, no good deed goes unpunished: since the scavenger hunt was my idea, I've been tasked with preparing the activities. That's where YOU come in. Any ideas? I'm looking for things students can buy or photograph, or conversations students can record, or places students can go that would help them practice Japanese and/or get a taste of everyday life in Tokyo. Some examples:

-Find a McDonald's and eat something that's not on the menu in Korea.
-Photograph 5 examples of globalization.
-Find the post office/supermarket/bank/police station in a specific district. (Vocab practice.)
-Go to a supermarket and find out how much certain items cost.
-In the supermarket, find an item that is more expensive in Tokyo than it is in Korea.
-In the supermarket, find an item that is less expensive in Tokyo than it is in Korea.
-Buy and eat a snack food you can't find in Korea.
-Sing a karaoke song in Japanese.
-Videotape yourself ordering lunch in Japanese.
-Videotape yourself asking directions in Japanese.
-Videotape yourself introducing yourself to someone in Japanese.
-Videotape yourself introducing yourself to someone in English.
-Photograph 3 examples of traditional Japanese architecture.
-Photograph 3 examples of modern Japanese architecture.

...etc.

The rules: Students will be in small groups (about 6 each). Each group will have a teacher chaperone/judge. Each group will be assigned a section of the city to work in. Each group will have a digital camera and a video camera. When we get back, then, we'll put the photographs and videos together as a presentation for the parents.

Any and all ideas would be a huge help! The plan is for the activity to last several hours, so the more activities/items, the better.

Thanks!