I envy you!
I envy you - especially because I know how much fun you are going to have.
We are boatless now, but for 12 years in a row we spent four weeks starting in early August each season in the North Channel aboard our Ericson 38. Those are hands down the best memories and happiest times I can recall.
The one thing we did to maximize our time up north was treat getting there as a delivery, and sail through the night to get it done. We kept our boat in Bay City Michigan, and while most folks would spend 4 to 6 days getting from there up to the North Channel - at just 30 miles a day - we would leave the dock at 10 AM on a Saturday, sail through the night up the length of Lake Huron, enter the Mississagi Straight at daybreak, check in with customs at Meldrum Bay by 8 AM, and be anchored further north at Bear Drop Harbor by 2 in the afternoon. About Wednesday of the fourth week we would begin to look for a weather window, and return home the same way. You could easily do the same from Petoskey in one day.
Be prepared though. Four weeks aboard the boat is long enough that you forget how to drive, forget how to type, forget all your passwords, and forget everything that you left behind at work!
Good luck!
Steve Christensen