Look where you want to go. If you look at a tree or post or other hazard, that's where you will go.
Read the signs along the trail and at the lift. Especially the warning signs - Slow, Easiest/No Easiest Way Down, Experts Only, Move Away From The Unloading Area, etc.
Don't decide to try harder runs at the end of the day. As pretty as it might be up high on the mountain, you're more likely to be tired and get stranded.
If you're not sure how to board or ride a lift, ask the attendants for help.
Take your pole straps off before boarding the lift, hold both poles in one hand, don't try to use your poles when off-loading the lift - let gravity take you down the ramp.
Don't stop at or block the lift entrance or the lift off-ramp.
Don't use your cell phone to call 911 if the lift stops, there's nothing they can do.
If you're over-terrained (on a slope over your skill level), stop and ask for patrol help. They'd rather help you
before you wreck.
If you fear that your partner is lost on the mountain, check your vehicle, the restaurant
and the bar before you get worried.
Seriously, take it easy on the drinking.
Be nice to patrollers, they just want you to have fun and be safe.
For that matter, the same goes for just about all employees.