North Peak Brewing, Mackinaw Brewing Company, and Right Brain Brewery are all in Traverse City and There is a place called The Traverse Brewing Company in Williamsburg nearby.
I'm going to TC on Friday and plan to hit Right Brain for the first time for lunch. Check out their website:
http://www.rightbrainbrewing.com
Their website says they dont' serve food, but you can bring your own in. I've been to the others and have had great experiences in both. Love the pulled pork at Mackinaw!
Also if you are going to GR try Founders. Have been there once and would love to go back again. Some great beer there!
EDIT: Forgot to mention that a guy at Right Brain said he'd hook me up with a sack of grain since I can't find anyplace in Northern Michigan that has bulk grain (Diversions has some brewing supplies, but when I asked about grain I had to explain exactly what it was I was looking for. Not a good sign and they quoted 50% higher price than other supply shops downstate). He might even sell me some bulk hops! The price quoted at Right Brain was $40 for 50#, the same that I have seen at Michigan Brewing Company (THings beer) and Siciliano's Market). They don't normally sell brewing stuff, but I think he was impressed that I new something about brewing and wanted to help me out.