Thanks for all the info.
I had no idea there was etiquette in the park, since I just started to ride it. The two major places here in SoCal are Bear Mountain and Mt. High, where the whole place is a park, and nobody hikes.
The one time I saw a small park section was in Alpine Meadows in Tahoe. I had no idea people hiked up to ride the 50-yard park they had. So the last run I did that day, I was just bombing down the mountain and rode right into the park. I managed to hit one box, then ate shit on a jump.
That was my bad, I didn't know there was a calling system and such. Do you fall in line?