Here are a list of cheats and hints from Super Mario 3D Land.
Get to World 2 faster
In the 2nd Level, when you get to the section with a bunch of walking Koopa Troopas and Blocks, jump on the one to the back of the far wall. You should be running on a platform reminiscent of the one in the original NES Game.
Run and Long Jump over the gap, to reach a Pipe sending you to World 2.