I've hiked twice from Temperance River State Park to Crosby-Manitou State Park. Its an excellent section of the trail though I can't speak to other parts of the trail. Its not a terribly difficult segment of the trail...there are a few areas that are a bit challening, but then you can go a full day of relatively flat hiking. We did this over three nights and the biggest issue here was finding a campsite. We had problems  one year finding a site between Temperance and the Caribou River (all sites we're taken), but there were plenty of clearings to camp. The multi-purpose site at the Caribou River is tremendous. Two full out sites along the river with waterfalls and great swimming. If you want to camp in Crosby Manitou park you'd be wise to reserve a site ahead of time. I did this segment with a group of about a dozen 15-year olds and it took us more or less two and a half full days.