In level 2-2 (Sloppy Sands), before the checkpoint pig there are two squid turrets below a bridge. Using Diddy Kong's jetpack, super bounce from the lower squid to the higher squid that gets shot out from the turrets. After hitting the higher squid bounce again on the lower squid and repeat. You can repeat this for as many DK Coins as you want.
All you need to do is good to a level that has a Diddy barrel, preferably one where he's at the begining open it and the leave the level you now have diddy kong without having to play through all those hard levels.
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