This one is actually really fun! Follow the path over on logs and talk to guy. Big Daddy of Blooper-surfing. Follow the trail of coins. Jump before tunnel - get blue coin! Now into tunnel.

This is a Timed puzzle. You have to get better than 45 seconds to win the level. 44 gets a shiney! In essence just do it a few times to get the hang of where to turn and where the obstacles are going to be.

Super Mario Sunshine Walkthrough