What's the best meditation retreat in Koh Phangan?

Hello you all,

I'm interested in joining a meditation retreat. I still do not know how many days I'd like to spend there, but I'm willing to do it even for a complete month, because I'd like to refocus my life, find a higher meaning and learn how to control my thoughts and emotions, and I think this is the perfect solution.

I've selected Koh Phangan because it is the most beautiful island in my opinion, and joining a meditation retreat located there would be a dream come true.

Thank you all in advance for your recommendations!