1 Sleep in a tiny capsule hotel
2 Buy a square watermelon
3 Go on game shows about eating noodles in a washing machine or climbing slippery stairs
4 Get a bottled flying fish from a vending machine
5 Pay to have a complete stranger come sleep with you at a "Cuddle Cafe"
Besides the name this is no different from a brothel in the western world.
6 Bathe in a bunch of ramen noodles
7 Meet the man with a white beard on Christmas Eve... Colonel Sanders
8 Go to a festival about... a certain male body part
Yep, you know which one.
9 Visit a maid cafe
10 Visit a cat cafe
11 Visit a robot restaurant
This is getting prevalent nowadays.
12 Play in a real life Mario Kart
13 Get used undergarments from a vending machine
There have been conflicting reports over whether or not you can still do this, or when exactly it ended (again, if it ever really did).