KNOW YOUR LIMITS - start on the smallest feature and work your way up. it is one thing to have the grapes to go off the biggest kicker, but it something else for you to not clear the knuckle or to just yard sale it.
CLEAR THE LANDING ZONE - if you stomp or wipe out the landing, get the hell outta there. 99% of the time you cannot see the landing area and so the next jumper has to assume there are no bodies for them to risk landing on.
LOOK UP HILL BEFORE LEAVING - coz 'speed is your friend' and there is the 'go big or go home' mentality, it is safe to assume that several / many people will start their run in behind you. so check over your shoulder when you set off, to ensure you won't cut up anyone or that they will be forced to cut you up.
i find a good way to establish when you're gonna go, is to join what looks to be a queue and then when the guy in front of you goes, stand up and slip slide down a bit. there are a lot of posers and bullshitters around who just watch or lose their bottle, so don't stress queue jumping.
and no, walking back up hill to session a single feature isn't a crime. just don't walk on the run in track.
all this being said, parks are for monkies! the essence of snowboarding is to explore the mountain, so take a shovel and build your own kicker. never go into the park until every last piece of powder is tracked up!
WEAR A HELMET.