Let me know what area or suburb you will be in. Probably the best thing will be to find a route that goes out to the Lake. It's probably about 60 miles (max) round trip depending on where you start. I do not live in Grand Rapids, but I grew up there, and I did a few rides last summer out there while visiting my parents. You might also try hooking up with the tri club @
www.michiganoutlaws.com. They aren't far away from Grand Rapids, and could probably recommend some good routes. Personally, I know the south side of Grand Rapids (Wyoming, Jenison, Grandville) areas the best. Hope I can help,
Jack
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"What the mind can conceive and believe, the mind and body can achieve; and those who stay will be champions."