Couple things to add that will really help.
DO NOT go through the park unless you're gonna actually hit the jumps. You're just taking up space if you're just ridin' through.
While you're at the top, pick your line and stick to it. What I mean by line is the series of jumps and hits you'll be going off of consecutively. Most parks have a nice flow built into them with different lines. Try to stick with the parks actually lines and don't cross over from one to the other. For instance, you hit the jump on the right, then right away cut all the way over to the left for another hit. Somebody might be on the left and you cutting in front of the landing could ruin the day.
If you HAVE to hike, get out of the way and don't tromp around in the landing and run in areas.
Do NOT side slip up the jump or ANYWHERE in the run in. Decide what hit you're going for, commit and go for it. Otherwise, you're gonna mess up all the hard work the park crew puts in to those jumps and you're gonna piss off those that are hitting the stuff. This will also help you land jumps better. Second guessing your self makes you fall. Confidence makes you land.
Always look around, left, right, and behind you. You never know when somebody's comin' in hot.
And if there's a beginner park at your resort, stick to that until you're comfortable.
Last but not least... learn to ride a snowboard before you hit the park. Not just on easy groomers. Actually ride. It will help you temendously.