I get out MTBing a lot. Outside of my home trails we've hit Kettle Moraine (just OK), we ride the snomobile/atv trails in Northern Iron Cty, Wi. (Pines-n-Mines), The trails around Powderhorn & Indianhead Mtns., Chequamegon Area trails, We rode at Copper Peak in Mi. when they used to let us take bikes on the lift, We've hit Marquette Mtn. & surrounding trails, Houghton/Hancock area trails, and over the years we've made various trips to Snowshoe area WV, Winter Park, Co., Lake Tahoe, NV, Moab, UT, Lake of the Ozark area trails & some others I'm forgetting. The guys I ride with have been friends since high school and we've been doing it for at least 15 yrs. A few of them are my snowmo buds too. It gets me by when the snows gone.
My two current bikes are a Klein Adroit Race (hardtail) and a Turner 5-spot pro build (full suspension). I primarily ride the 5-spot, it's an unbelievable ride. Tuning the suspension on my bikes has aided me in setting up my snowmobile suspensions as well. Finely tuned suspension on either makes for a whole different ride.
Our local trail (1/2 hour from my house) is where they would have held the Olympic MTB had Chicago been awarded the Olympics.