"Downtown" is the first of three city areas to the right of Main Street on Super Power Island. There are three super villains (escaped prisoners) at large there, two of whom you need to capture before you can earn your flying power. (see related questions)
The subway is Downtown on Super Power Island.
Speeding Spike is in the Subway at Downtown.
It is just farther right from Downtown. The main areas of the island are Prison / Main Street / Downtown / City Park / Junkyard
All you can get is the flying power, and only on that island. After you defeat the other 5 super villains using your wits, you will receive super flying power, which you need to capture Betty Jetty atop the skyscraper downtown.
The skyscraper is past the bank, downtown. You need to be a superhero to go downtown (get your ID from the costume store, and visit the prison).
The bank is Downtown on Super Power Island. They experienced a robbery by the super-powered criminal Copycat, who can split into 10 identical copies of herself. (see related question)
Once you have captured the first 5 super villains, the phone will ring on Main Street. Answer it to get your Super Flying Power. You can turn it on and off with the icon at lower left, and it only works on Super Power island, and any ad games there. Use the flying power to chase and capture Betty Jetty at the skyscraper Downtown.
The island after Super Power Island was Spy Island.
The bank is Downtown, to the right of Main Street. Once you have your Superhero ID (from the costume store), you can get your information and handcuffs from the County Prison, and then head after the super villains.
Defeat the other 5 super villains (all but Betty Jetty). When you walk past the telephone booth, it will ring. Answer the phone and you will be given the power to fly. Now you can go after Betty Jetty, on the skyscraper Downtown.
No, there is no "super strength" on super power island glad to help :D
There are no cheats in super power Island.