We have stayed in the Sinks yurt system many times, but winter is our favorite. There is electricity, spotty internet and a heater you can turn on. 10 below zero outside and we keep it at about 45-50 deg inside. Super clean, very well maintained. You are required to clean well before you leave. Sleeping on mattresses/bunks or fold out futon mattress. Also inside is a small table and chairs, pine carved furniture. Broom, mop, cleaning supplies are provided. When we have stayed in Winter, no other soul is there. The park plows and shovels before your arrival. The Milky Way is spectacular on a clear night. Photos below are both winter and summer. In the summer, you can hear rocks and boulders rolling in the Popo Agie River (Pronounced "Puh- Po Shuh" (two words). There are 4 yurts that sleep up to 6, and one very large yurt that sleeps 12. Picnic tables, pit toilet, fire ring, trash bin nearby. In the winter, bring your own wood. Many good hikes in summer and a few trails to XC ski or snowshoe in the winter. 

You can shower at the city pool on 9th Street for a small fee.