The Home For Infinite Losers, or more commonly known as Hell. You may find the exit to the real world without needing to be revived, but it will be difficult and you may meet resistance from the guards and other residents.
The Sacred World of the Kaios is where the Supreme Kaio and his students live. It is around the size of a 'normal' planet and similar in appearance to rural environments on the planet Earth, but with 100x the gravity.
The miniature planets of the Cardinal Kais. Each is found in each respective direction from the Check In station at the end of the infamous Snake Way. They are each tiny planets that have the gravitational force equal to x10 Earth's gravity.