Can't really help you w/route as we did a tour of the "mitten" part of MI so we were all over the place.
For Petoskey, we stayed at Hearthside Grove
(see my photos).
Beautiful Class A resort. Just fun to walk around & see all the high dollar coaches there. Although we haven't stayed here, I've also read good reviews for Bay Harbor
, now under new ownership.
Things to do:
Drive (in your car, not RV) M119 the Tunnel of Trees
route & get a bite to eat at Leggs Inn
..delicious Polish food. Yummy chocolates & fudge at Kilwin's
You're about 2hr NE of Sleeping Bear Dunes
& Traverse City
area. Walk to the Dunes (well, not from Petoskey...I meant once you get there
) & take a stab at climbing up the 300ft dune. Going down it is easy...getting back up, that's the hard part. Tons of wineries
in the area too.
You're also about 45minutes south of Mackinac (pronounced Mac-in-naw) Island
. That's a great day trip.