I live at a ski resort so here is my list of must haves:
1. Base layer: Leggings and Turtleneck (either Nike Heat Gear or Under Armour)
2. 1 pair of Ski/Snowboard socks (Acrylic or Wool)
3. Mid layer top (Mid weight zip neck top)
4. Ski Jacket
5. Ski Pants (Burton makes my favorite ladies pants, check Amazon)
6. Helment & goggles (No matter what! Don't need ti for tubing)
7. Good gloves (Some snowboarders like gloves with wrist guards built in...more expensive though)
8. Face Mask (
http://www.buckmans.com/men/accessories/face-masks/slamdanna-facemasks-15962-o4i_15962.aspx)
9. Handwarmers (I put one in each glove and they last for hours. If they get too hot put them in your pocket for later use.)
I also would also recommend taking a knit cap for wear when you are not skiing / boarding. I am also the poster who said I typically wear trail running shoes around the resort.
I don't know where you are going to ski, however, if it is a big resort it may be beneficial to have a small backpack. I skied at Whistler several years ago and wore a small backpack everywhere. In it I carried water, some snacks, tissues, extra hand warmers). It was a lifesaver out there on a big mountain like that.
Here's a link:
http://www.amazon.com/Dakine-6-8210060-Avery-Parent-Womens-Backpack/dp/B00HZ00Q66/ref=pd_sim_468_4?ie=UTF8&dpID=51090wGA2yL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0FPH2B1MJ1JEYPAHVV1V
Also, beginning boarding is brutal on the tailbone. Some people wear "butt pads". This is optional however, I'm just throwing it out there for reference.
Have a great trip!