There are lots of videos on YouTube on how to open a young Thai coconut. Here's one:
They all lie. I needed a screwdriver and a hammer and lots of messy work to open the coconut that a friend gave me. But having finally opened it, I poured the juice into a blender, scraped out the meat and added it to the juice, then added vanilla ice cream and some crushed ice and blended it all. It was a very nice coconut smoothie that'll never be worth the effort again. :) I'm glad I did it once; next time I'll just buy a can of coconut milk for 99 cents.
I'm totally slapping the "Catholic desserts" label on this post because at the end of that video the guy explains how coconuts prove the existence of God. :)