You can go as extravagant or inexpensive as you like. For food, inexpensive places that make local food (fish in creole sauce, rice and beans, for example) are dirt cheap. Beaches only cost if you go to one other than your resort and want beach chairs, umbrellas, drinks, etc. Booze is not outrageous, and there are plenty of happy hour deals up and down the beach, but you can also buy it even cheaper at the duty free shop before boarding your plane, and mix your own.

Nice restaurants and nightclubs are at expected tourist prices.