I realize this is late to be responding, but here goes... maybe for your next trip.
I've been visiting Acadia every Fall for almost ten years. I always go the second week of October and stay for a week. In nine visits, I've always had decent weather (usually one day of rain in a week) and good color. Foliage doesn't all peak at the same time, so don't worry about being there for the 'peak' time- it lasts about two weeks. I would say that after about the 20th, everything goes downhill fast, though you can still find pockets of color.
But besides the obvious great images you can make of the color, there're plenty of other great locations- the coast, especially, is beautiful and I actually prefer to shoot there than shoot the foliage. You can get some nice images of the lakes and ponds too and while they look better with the color reflecting on a still day, they're still very scenic.
Even a day of rain helps out- by the time it's over, the streams have turned into rivers and waterfalls. Honestly, you can't go wrong in Acadia- except in winter when a lot of the roads are closed or un-passable with snow. Have a look at my website to get some ideas of places to photograph.
