My grandparents live near Berlin. My grandma is ex-Amish.
They happen to call it “BER-lin”, FWIW. Not sure if that’s how everyone pronounces it or just them cuz they’re weird.
Heini’s is good, if that’s the one that has the free samples. Last time I went to a cheese factory with my grandparents everyone was just lined up around the circular store trying cheese!
When you’re in Sugarcreek, check out the Swiss Village. Not sure what goes on there in the fall/winter, but you at least have to see the neato moving art on top of some of the buildings.
Here’s a Web page with a little info on Berlin, and the site has more info. Here’s a Web site for Sugarcreek. Here’s another Web site for “Amish Country”. On that one, make sure you look at stuff only in Holmes county. The Geauga county Amish are much further away.
I love love love Rolling Ridge Ranch but it’s kind of cheesy. It’s a drive-through “safari” with a petting zoo (I am 30 years old lol!) It’s in Millersburg, a few minutes west of Berlin.
The Behalt museum is actually really interesting, with a huge cyclorama painting and a guide to tell you Amish/Mennonite history. Unfortunately, it’s closed after October 
The main restaurant everyone eats at is Der Dutchman (the ones in Sugarcreek and Walnut Creek will be closest to you). It’s got your traditional Amish/German food. Nothing too exciting really. IMHO all of the tourist restaurants around there are the same - but, they do have “traditional” food so if you want it, you got it.
I remember one time we did go to some farm that did have a real Amish sit-down dinner, prepared by the Amish people who lived there and served on long tables. I totally forget what it was, tho. I’m sure you’ll find it in the literature.
I’ve spent a lot of time down there and as I said, my grandparents are down there…so if you have any questions let me know here or via PM.