Chris and Maddy's in Cofresi
El Sabrazon on the main road(right next to the park) in front of I think of the Supermercado Jose Luis, has great Sancocho
El Manguito which is walking distance and on the same road from the Iberostar Costa Dorada, is reasonably priced, and has good food.
La Cachita has great seafood.
And for a good burger, and fries, you can always try Hemmingways in the Playa Dorada.