The biggest thing is be polite. If you see that you accedently snaked someones line, apologize to them, either as they are riding by or at the bottom. Then learn from your mistakes.
Also, make sure to chack your "blind side" (the heel edge side) before you hit any feature to make sure everyone is clear.
Finally, if you are hitting a feature (especially a big jump), watch the people in front of you and make sure you can see them after they have landed. In other words, if you dont see someone after they hit a jump, don't assume that they are just behind the jump further down the hill. Make sure everyone is clear. If someone does fall, make sure that they are OK before you ride on.
Ps. If it is really buisy, ride with a friend. Get your friend to stand by the feature and signal you if you are clear to go.
I can ride my bike with no handlebars, no handlebars, no handlebars...