In Milwaukee for the weekend, I watched this year's Lakefront Marathon this morning. Weather was a little chilly for me--high forties, but the wind was at their backs, as it usually is for this race, and it was nice and sunny.
I ran it in 2003, the year my hip started giving me trouble and just before I found out I was anemic. That year was really cold, 31 degrees at the start, and didn't warm up much--I froze! The start is in Grafton, just north of downtown Milwaukee, at Grafton High School, which is directly across the street from my husband's company building. The course runs at a slight downhill through mostly residential streets, along the Lake Michigan shoreline.
It was once a good marathon option if you didn't get into Chicago (which is usually run a week later), but it has become so popular on its own merits that they now have a limit on entries and it fills up quite early. I would recommend it to anyone who wants a good qualifying time for Boston.
Milwaukee's LakeFront Marathon 2010