Stamp Rally

Every year there are many "stamp rallies" held in and around Tokyo. They are an excellent chance for family members to spend time together and have fun.
You can also use them as a chance to study a little English while you are spending time together. I can give you some ideas here on how to do that. You can use some of the following phrases:
Let's go to (Ikebukuro) station.
Where will we go next?
How many stops between A and B?
Which train do we need?
When is the next train?
Where is the stamp?
Are you ready?
Are we finished?

Nobody in your family has to speak perfect English to take advantage of these chances. In two years, there will be visitors from all over the world coming for the Olympics. For most of them, English is their second language too.
Start practicing now so that, in two years, you can have chances to interact with people from all around the world.
Good luck!!