Alta and Solitude are two of my favorite places on this planet.
I may upgrade my ticket to an Alta-Bird combo one of the days, but I am thinking I will probably spend all three days at Alta this time around -- there is more terrain there than I could explore in five days, never mind three!
The combo pass is not worth the extra money. You are better off buying a single day pass at either area. There is plenty of terrain at each mountain. Alta - $59, Snowbird - $69 (tram), $59 (chair), Combo - $84.
Wow, just noticed that Alta is pushing the $60 barrier. While it is still value priced, it is no longer cheap. Canyon Sports only saves you $5.
I've got some 186cm Fischer Watea 94 skis lined up for the trip, which is good; I don't really have a suitable above-treeline, big-mountain, wide ski in my quiver. I think my PEs would probably do OK, but 179cm is short for my weight and height for the kind of skiing I plan to be doing at Alta.
You'll still be doing a lot of skiing below treeline. Some of best lines are in the trees, trails cut through the trees, or through tight spots.
For terrain hunting, Alta is a funny place. Most of the primo lines are visible from below; you just have to figure out how to get to them. This is not as easy as it would seem.
Even a trail as obvious as Alf's High Rustler is tricky to get to. Follow High Traverse (High T) until it cuts across the top of the ridge (infamous mat area.) At the mats, take a very tight left, and follow the traverse near the top of the ridge line (stay high, don't go low.) Just before the ridge ends or right at the end, bear left down the other side of the ridge. It opens up after a bit, but some of the initial lines into Alf's have a bit of a pucker factor depending upon which one you hit. You are going from one side of the ridge, crossing to the other side, and then crossing back to the first side to get to where you want to go. Make sense? That's Alta, and part of it's beauty.
The other stuff you'll have to find yourself.
Beware, a lot of the traverses (High T in particular) can be bony and *very* bumped/washboarded up, so pay attention. I almost got a concussion one powder day on High T. It was nearly a whiteout on the open faces, like the other powder hounds I was going 90 miles per hour on High T to get to the next powder line, and then plowed my ski tips into the front face of a three foot dip in the snow. Couldn't see it at all.
Collins - Wildcat - Supreme. Which lift to choose first on a powder day? Everyone has their favorite.