Throw some grass seed and lawn fertilizer... in November.  Bend down and rip the weeds apart by hand and leave the roots to rot in the ground, they're rich in nutrients.  Mow three inches high until September then cut shorter.  Don't use tap water, it's too cold and the chlorine will pancake your soil.  This way you will have a nice lawn as part of your 'landscaping' just the way it was done a hundred years ago.