Where is the key in Diddy Kong Racing DS for the oceanic area?

Question

I don't know whether it's in Whale Bay, Crescent Island, or any of the other options. I need this to move on to the following levels. Please help!

Answer 1

The key is in cresent Island. Once you pass the first tunnel area in the begining of the race, go all the way to the left side of the track and you'll find a pond with the key in it!