Taunus

Gimbacher Hof - Kelkheim - Traditional German food, set on a farm with horses, a garden, and a wide variety of cakes.  Several trailheads behind the restaurant lead directly up into the Taunus forest. 

Eberhards Scheuer - Bad Soden - great garden restaurant, good prices, local food, a bit hard to find

Restaurant Thessaloniki - Bad Soden - good Greek food

Valentins Flammkuchenhaus - Königstein - great variety of Flammkuchen toppings and flavors

Villa Borgnis - Königstein - German/International food in a beautiful park setting at the foot of the Königstein castle

The Lodge - Kronberg - upscale restaurant with some of the area's best beef

The Schlosshotel - Kronberg - for 'high tea' and other elegant occasions

Heidekrug - Oberursel - authentic Korean food

Sabai Sabai - Oberursel - authentic Thai food

Anaya Indian Kitchen - Oberursel and Bad Homburg - authentic Indian food

Wiesbaden

Benner's Bistronomie - located in the stunning Wiesbaden Kurhaus, definitely a great choice for special occasions

Dale's Cakes - Tiny but wonderful with a varied menu and homemade American baked goods (best Carrot Cake ever). Perfect for breakfast or lunch. Don't miss the secret garden out back in warmer weather.

Der Andechser im Ratskeller - Bavarian food in a cozy restaurant located under the Town Hall on the Marktplatzwin

Erawan - authentic Thai food at a beautiful restaurant

Manoamano - Amazing cocktails and pizza in a great atmosphere, perfect for a date night without the kids

Noir Finest Sushi Cuisine - delicious Asian Fusion 

Saytoune - great Middle Eastern food

Goldgasse (also known as Italian Alley) has several Italian restaurants with year-round indoor/outdoor seating. All are good, La Cantinetta and Aurum are recommended.

Frankfurt

Mona's American-style breakfast - best American breakfast in Germany right in Frankfurt

Mangetsu - authentic Japanese in a casual venue

Apfelweinwirtschaft Dauth-Schneider - Apfelwein restaurant in Old Sachsenhausen with traditional Frankfurt specialties like pork knuckle, schnitzel, and handkäse mit musik (look it up)

Das Noodle Ding - Homemade Chinese noodles & soups with spicy sauces in a simple dining space

Bar Shuka - Female-run cafe with funky decor and Middle Eastern fusion on a wooden patio

Margarete - great place to meet a friend for brunch, wine, and modern European cuisine

Trattoria Rustica - authentic Italian with fresh ingredients

Wetterau

Restaurant in der Alten Muehle - Bad Vilbel - European German casual with riverside outdoor dining

Restaurant Paso Doble - Bad Vilbel - Steakhouse, Spanish

Restaurant Lindenhof - Bad Vilbel Golf Course - German and Mediterranean with pond and golf course views

Bastian's - Dorheim - Michelin noted French and German in a cozy house with garden

Uwe & Uli Zuhause bei Uns - Usingen - Michelin noted European dishes in a restored half-timber house on the market square

Zulegers - Bad Nauheim - German seasonal dishes using only products from the region

Da Maurizio - Bad Nauheim - classic Italian in a deli style atmosphere where they work with anyone's food sensitivities and sometimes cook for you outside normal hours

And & Vin l'talia in Cucina- Bad Nauheim - Italian dishes in a stylish but family friendly atmosphere by the tennis club

Ducky's - Bad Nauheim - German and Central European dishes for lunch and dinner, sometimes fixed menu

Semira - Bad Nauheim - Turkish cuisine in a modern casual atmosphere

Herrenhaus von Loew - Steinfurt - German and Eastern European offerings in a keller and garden ambiance in the village of rose growers

Licher Privatbrauerei - Lich - food, beer, and wine offerings can be coupled with a tour of the Licher Brewery not far from the Arnsburg Abbey ruins

Maison La Vette - Ortenburg - French and German in an historic stone house with brunches and evening menus to reserve in advance; well tailored for special events

Bergschloesschen - Gelnhausen - Italian in a small classic villa on a hill overlooking the "city of Barbarossa"