This is pretty impressive. I don't think I'm going to want to put my own to the test (if and when I decide to buy one), but this does show that there should be absolutely no problem wearing it in the rain, or at a water park.
The beach may be problematic, but due to possibility of salt and sand getting under the crown, not due to water.
Still, it is worth noting that when Consumer Reports tested the Apple Watch, that one out of 4 samples failed a 24-hour submersion test:
We set our depth-test chamber to match the water-resistance specification claimed by each smartwatch manufacturer. We submerge the watches, then check them for proper functionality immediately upon removal from the chamber, then again 24 hours later. The stainless-steel Apple Watch passed the test on the first try. The first aluminum Apple Watch Sport we put through our immersion test seemed fine when we took it out of the tank, but we experienced problems with it 24 hours later. We then tried two more samples, which showed no problems, so the Apple Watch Sport passed our water-resistance test.The failure may have been a manufacturing defect, but defect or not, you probably won't get a Warranty replacement if it fails after being submerged in water, because the water-resistance rating Apple is publishing only promises 30 minutes at 1m depth. I'll be interested to read the reports when, in the future, some people try for warranty replacement after submersion in water for longer than 30 minutes or at a depth greater than 1m.