Whistler Pro tips
Avoid the lower mountain and the "family zone" near the Roundhouse on upper Whistler mountain. Lots of lesson groups and beginnermediates and not much else. Ride up top on the more technical stuff as long as conditions are good.
For the Blackcomb side, I really like entering the Blackcomb glacier via Spanky's Ladder (VERY short hike up to ridge) and the gem bowls. Some fun stuff up there. The couloirs and chutes off of the Horstman glacier like Pakalolo and Dakine are favorites, and the wide open bowl rider's left off the top of 7th Heaven can be super cool.
For the Whistler side, there are three lifts that service the upper bowls, and there's good stuff off of each of them. I recommend pretty much all of it.
For me, half of the fun at Whistler is exploring the top sections of the two mountains. There are tons of bowls, chutes, couloirs, windlips, treeruns, etc. We rarely ride below mid-mountain unless it's to do a top to bottom at the end of the day. Take the Peak-to-Peak across the valley at least once. The views are stunning.
Fingers crossed for good conditions for your trip!
Spoke to the ex-girlfriend, who has spent a lot more time there than I have. She recommends that you hit up the top of the seventh heaven express chair/horstman T-Bar on Blackcomb and the top of the peak express on Whistler to get photos with the Vancouver Olympic stone statue dealies. People dig that shit. You can also then ride down the runs where the alpine events were and imagine doing so at race speeds, which is fucking nutso.
Also: where are you staying? Might be able to recommend bars and restaurants in the village and creekside.
You'll find stuff that you like all over the place though. I do recommend checking out the high alpine, though. A lot of the best stuff (in my opinion) is actually up there above the tree line - and it should be quite the experience coming from the midwest. Hopefully you'll get some deep days.
If you want to get an idea of what the terrain is like, there are a ton of videos online from people's GoPro vacation videos. Here's one of Pakalolo on Blackcomb, which is one of my ex's favorite runs: