How do you find a cug in super Mario sunshine?

In Super Mario Sunshine, a CUG (Coconut Under Glass) can be found in the level Pianta Village. To obtain it, you need to break open the glass case that contains the CUG by using Yoshi. First, you must find a coconut and bring it to Yoshi, then use Yoshi's juice to melt the glass covering the CUG. Once the glass is gone, you can collect the CUG.