yes, I'm a born-and-bred Mainer. I'd go to Mount Desert Island in late September or early October if your goal is leaf-peeping. Take a day trip to Schoodic Peninsula from there. Dr. Cupcake described Bar Harbor as touristy; it is, but the rest of the island is a little less so, and although Bar Harbor is "touristy" it is really just a beautiful little seaside town. I don't know exactly what sort of rural markets you're after but there are some art outdoor markets on the village green (more in the summer), the Beech Hill Farmers Market, and you'd see a fair amount of other farmers market type stuff on the drive there.

What I'd probably do is fly into Portland, spend a day in that area, then go to MDI. You'll get some good leaves just on the drive. The food in Portland is more hip than anything else; Bangor is developing. But I wouldn't plan to spend any significant time in Bangor; it's very boring*. MDI is nice because you get lakes, ocean, mountains, trees, and leaves. The only thing you don't get is city.

*Stephen King's house has cool gates with bats on them. This is the exception to the "Bangor is boring" comment.

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maybe she's born with it, maybe it's chlorine
If you're injured and need some sympathy, PM me and I'm very happy to write back.
disclaimer: PhD not MD