Cheat: Complete Story Mode
The code is Treyarch backwards which is HCRAYERT. You'll start 40% into the game, with 200,000 hero points and some upgrades.
Hint: Liberty Island
If you want to check out the Statue of Liberty, just hop a ride on a helicopter. If you land in the water close enough to Ellis Island you can climb out of the water onto it.
Unlockable: Theatre and Fight Arena
To unlock the Spider-Man 2 Theatre, and the Spider-Man 2 Fight Arena, simply complete all the missions in Chapters 1-15. In Chapter Sixteen you'll have free-roam with one mission: Get 50,000 more hero points. Go to a store with 6,000 hero points or more Now, scroll around for an icon of a camera. It costs 1,000 Hero Points. This is the theatre. You'll be able to watch the Credits, Treyarch intro, and Activision intro. There's a spider man posing icon next to it. It is labeled Fight Arena. Buy it for 5,000 hero points. The warehouse where you FIRST battled shocker is where this arena is. You fight a wave of criminals in separate rounds.
Hint: Last Speed Upgrade
To get the 8th speed upgrade you must get up to the 16th chapter and defeat it. When the new chapter starts get 50,000 hero points and go to the shop. Swing upgrade 8 should be there unless you haven't upgraded it before.
Easter Egg: Evidence of Vulture Fight
Head over to the Chrysler building (the tall building near the Empire State building), up far enough to where there are green pyramids on 4 corners of the building, and go around the building. You'll find green feathers on the building, referring to the first game when you fought Vulture there.