Crowds, price, terrain, lifties, isolation, family friendly
Short season, limited snowfall
This little ski hill is a great secret to those living in southern Idaho, and those people would probably like to keep it that way. It only has two double lifts, and just a little over 1000' of vertical, but for a relaxing day of laid back skiing, Soldier is hard to beat.
There are never any crowds to speak of. They only open the mountain four days a week, so if a storm piles it on midweek, you can have fresh turns on the weekend. The price is unbeatable. It might be the most family friendly resort in the state given that there are no crowds, a decent bit of beginner terrain, and very friendly staff.
The biggest downside is the snowfall. Soldier is located in relatively dry southern Idaho. It is probably less than 20 miles from Sun Valley as the crow flies, but its summit is what mid mountain is at at Sun Valley. As it is, the resort is nestled in the foothills, rather than being perched in the mountains, making it subject to more aggressive thawing periods, and a lot of southern oriented exposures burn off the snowpack in warmer periods. Best to go late winter when the snowpack is at its peak.