Terrible advice, don't try to show off by having your DIN set too high, especially for park.
I'm 150lbs, 5'11, ride at 9 and hardly ever in the park, and it's just fine, although it does not release where it sometimes would before. Depends on what type of skier you are, if you are an "expert" skier you should be able to adjust it yourself knowing your abilities. Falling down a 50 degree slope will put more force on your body than underrotating a 3, so lower DIN is better for the park.