These are approximations (in USD).
daily lodging: $25
OP said he's staying the week at Rocky's for $275, or $40 a day.
daily food bill: $25
If you eat inexpensively all the time. An adult size serving of Rocky's ribs costs about 12 bux. Morua Moi and PJs will set you back 15-20 for a dinner entree.
daily alcohol/bar bill: $25
Depends on what/how much you drink. Obviously Presidentes cost less than Goose & Juice. Either way, be sure to build in water & juice to the budget. In that climate, both are necessary day and night, esp. to a Canadian.
daily chica fee: $50
Only if you want them all to look at you as the cheapest gringo in town. I'd increase my generosity by 50-100%, especially if you won't be offering them any food or drink b/c you ran out of food money on day 3.
Remember, the OP also asked about excursions. I haven't seen any good ones for less than $40, usually much more. Of course, that doesn't include outings with expats who know their way around.
Also, remember the OP has to include stuff like cab fare to/from the airport (20-30 each way), transportation to Cabarete, motos, snacks, any shopping
and of course the "stuff happens" fund.
total daily expenses: $125
Again, I'd double the number, and be happy with the leftover money (and amazing memories)I got to take home with me.