Area 1 Skip
Surrounding Bikini Bottom, there is a red dotted line indicating the level's boundaries. Passing the red line for too long will cause Hans to place the player back in-bounds.
Beyond the Jellyfish Fields taxi, there is an out-of-bounds aura that instantly causes Hans to place you in-bounds. Hans can be disabled, allowing further access to the area beyond the aura. There is one last barrier though. An invisible wall exists, blocking the player from reaching Area 2 easily. Thankfully, there is a section of the road that is intangible, allowing SpongeBob to fall through.
In addition, a fence blocks SpongeBob from advancing to area 2 before defeating Robot Sandy. To prevent the player from jumping the fence, an invisible wall stretches far up into the sky.
There are several methods of bypassing both invisible walls, with and without cruise boosting.