From the game Crash Twinsanity for the Sony Playstation 2
When you get to the point where you can take a boat from the main island to Cortex's Lair and visa versa, approach the boat. If you jump on the boat like it tells you to, it will take you to Cortex's Lair/the main island but if you do a body slam onto the boat, it won't.
Submitted by: Mitchell VanRassel