Killy is fine for a bus trip. You get a variety of terrain, and, honestly, if you catch it on a snowy day, there are some great runs! If you're staying for a day or two, town is a blast, even midweek.
If it is a snowy day, do laps off the SuperStar Quad. Ovation, Skylark, Nowhere, Somewhere, and all the trees in between are great runs when the fluffy fluff is falling. Also, wander back to bear mountain. Everyone is a park rat out that way, so the side trails and trees are often quite tasty. Though Canyon Quad is slow as eff, you can get some good runs on Big Dipper...just go deeper into the woods and wear a helmet.
Traveling the States and Taking Pictures