4/5 =80% Recommendation
Five is tough to come up with but there are these good ones:
Neptunos, behind the Hamaca and quite near that other place mentioned.
The Swiss place on Duarte next to the coffee stand is good and has A/C
The Chinese restaurant in Hotetur Dominican Bay AI resort is open to visitors and has better than Duarte chinese food if a bit not spicy enough, at fair prices with A/C as well.
A real find is D'Nancy behind the Hamaca (right behind the big building, not via the Hamaca road) and down from the cab stand near the Hamaca
Some people like either Italy Italy or D'Lucien, I find them both medicore , hot and with not good service.
So there's four to recommend.
There is YAO (yet another owner) of the Italian restaurant in Costalunga - Ii ate there twice 2 weeks ago and was quite pleased. Vs. staying there for 4 years and eating there maybe once before in all that time.
For breakfast I suggest Garant which is a bit $ now for RD$150 + RD$40 for juice but it is clean, good service and good well made food.