If you will go out from resort, try to rent a car (50-70$ a day), the hotel taxi will charge you crazy prices (from 80 to 250$ per trip).
This is the only way, you probably will leave the resort, with the bus wil be more complicated for you but if you want little bit adventure, try to find Caribe Tours bus station close to your resort (is cheap and comfortable).
In normal restaurant in center of city (Zona Colonial) the prices are around 10$ per meal. Don't try Hard Rock cafe, they almost double the prices for normal burger you will pay around 20$ (for some reason, Dominicans love this "fast food" :)))
Bars, discotheques normally don't have entrance and if so, it is maximum around 15$.
But definitely compared to UK, the prices are really better in here.