We visited the area in October 2013, when tourists were pretty few and far between, and many of the restaurants were closed for the season. We ate at the Alpine Inn a couple times. It's a cute place, and it was busy even in the off-season, with most of the customers being local folks out on a fancy date or celebrating a special occasion.
It's a very limited menu: filet mignon/potato/salad, or spaetzle. We never tried the spaetzle. The first night, we ordered medium rare, and the steaks were super-rare. We still ate them, but other diners that night sent theirs back and complained loudly. The second night, we ordered medium steaks, and they came medium rare.
The salad was just a iceberg lettuce with a goopy dressing. My potato on the second night had not been reheated fully but my wife's was fine. The toast wasn't worth eating.
The desserts were a mixed bag. The cheesecake that people rave about is gelatin-based; not sure there was any actual cream cheese in it. The Apple Napoleon was better. There's like twenty things on the dessert menu, which is why we went back -- traveling with a ten year old, sometimes you have to make compromises.
The service wasn't very good on our first night, which is why we ate our undercooked steaks. Had somebody come by, we probably would've sent them back. The second night, service was fine. As others have noted, they don't take credit cards. There is an ATM but I'm sure it charges a fee.
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