I am trying where to do my 40 mire ride this Friday.
Long-view Lake - Beautiful, paved trails with bathrooms. Only downside, is the lake loop is only 6 miles.
Prairie Spirit Trail - Rustic, chipped limestone path that goes through the KS countryside. 50 miles end to end (I would do 20 out and back.) The drawback here is it is not paved and may be soft.
Both are about 35 miles from my house and are very nice. Just have to decide is if I want it easy (paved) or rough (limestone.) :)