12 is going to be pushing it for a lot of places. You are probably going to need 2 places near each other. Are you planning to stay on the shore or are you ok with going inland a bit. If you're going to be in town, check out the Easy Bay condos...they have a lot of options for different group sizes. Otherwise, if you want to drive over the hill about 15 minutes, Devils Track Resort has some really nice lakehomes and 2 of them would fit your group. It's a nice location to explore up the trail, do some fishing, run into town for dinner, or just sit and read a book with the northwoods as a background. We've gone up with big family groups a lot. Feel free to PM me if you need more ideas.