Okay,here's a cheat my friend gave me.
I'm pretty sure it's bullshit, but you can try it anyway.
First go to warm up,do a back flip and fall as close as possible near the dolphin.
When you get up,the rider will probably get onto the dolphin.You can then ride the dolphin onto the beach and get off.You go onto the pier thingy and walk into one of the huts.You will then be in a shop.
Buy a scuba suit or something,and dive into the water.You can now go out of bounds in your scuba suit without worrying about the time.
And if you head towards the sun and continue swimming for a really long time,you will find a whale.
I think you can kill it or something buy using a harpoon you can also buy at the shop.
But you have to shoot its eye.(this is probably all crap,but my friend sweared that he did it.)
Added by: Wave Master , ID#3063