I switched to snowboarding when I was 12 (and didn't pick up skis for the next 12 years). So as for terrain based learning, I've never done it. However, I've heard really good things about it. IIRC, TheSkiDiva tried it at Killington, and had a pretty informative write up on it.
I'll echo that protection is important to having a good time if you're falling a decent amount. Along with wrist guards, I'd recommend a set of padded shorts with a bit of tailbone protection (I know Burton makes some really nice ones, not sure who else does).
Other tips...
Just like skiing, get references for good instructors, and try to stick with the ones that work for you.
When you have a good instructor, ask for tips on setting up your board regarding the width of your stance and the angles of you bindings. I've seen a lot of people's skills be hindered by the board set up. If you're renting...remember these angles and your stance width so your board can be set up the same way every time.
I know it's hard to remember spur of the moment, but make a fist when you you fall, it will prevent your wrist from bending into unnatural positions.
Even though it's been awhile since I learned, I recall it being very physically demanding to muscles you wouldn't expect it to (mainly shoulders). Anything you can do to strengthen your upper body will make it more enjoyable, think push-ups.
Lastly, since you're on the east coast...on the really firm days...don't think twice, take the skis out instead.