There is a reasonably large selection of restaurants in Dominical, depending on what you're looking for.  A number of restaurants are geared towards tourists, and you will find food and restaurants with a more American or European flavor as a result. 

Right near the entrance of Dominical, you will find a little soda next to the Costa Rica Southern Expeditions office that serves sandwiches, fresh pastries, and desserts -- a prime stop to pick up food right before you head on a daytrip.  Past this soda is the Pueblo del Rio, where you will find a small 3-seat soda as well as Coconut Spice, an elegant Thai restaurant with views of the river. To the right of pueblo del rio 800 mtrs down the road along the river you will find   a unique and beautiful "palenque" restaurant  that serves international and local specialties that will surprise even the most discriminating gourmets.At  the cozy bar, you will find a variety of delicious tropical cocktails. To the left of the Adventure Education Center and Pueblo del Rios pharmacy, you will find Maracatu, which serves a variety of vegetarian-friendly dishes at slightly higher than average prices (expect to pay anywhere from $USD8-15 for a main course) .  However, they are one of few places you can find a tasty organic salad, filled with local produce.  They also feature live music on most nights.  Further down the road to the left, you will find the popular San Clemente Bar & Grill (known for its Taco Tuesdays -- 500 colones/taco -- and night scene) and the Soda Nanyoa, which serves reasonable portions at equally reasonable prices. Order a casada and you should have enough fuel for an afternoon of surfing.

Across the street and slightly further down the road, you will see Poco A Poco, a bohemian enclave offering book exchanges, DVD rentals, and WiFi, which serves delicious fruit smoothies and pastries as well as large and tasty tacos (though service can be slow since food doesn't appear to be their primary business).  

Continuing down the main road, you will past Thrusters, a beer and pizza joint that tends to attract an American crowd, and its sister restaurant, Fifi's Sushi Bar.  

Those who are willing to venture will be rewarded with the fine Italian cuisine of ConFusione, the restaurant attached to Hotel Domilocos (turn left when you see Hostel Piramys).  While prices are steep relative to most of the other options in town, it is likely the best place to wine and dine someone.

Other options include Tortilla Flats, along the road near the ocean, as well as the well-hidden Wauchacha restaurant, which serves food with Carribean flavor.   Sit outdoors on their stone tables surrounded by giant ginger plants for a little bit of faux privacy.