Thanks for your replies so far. To answer some questions...
They both have been to the country before, and saw some of the touristic side of it, but mostly in Bavaro. Of course they realise that starting an upscale and good quality restaurant in Bavaro, is as good as impossible, because it's 95% tourism here and thoose tourists don't dine out but prefer the buffet in their all-in hotel.
Allthough one week is not nearly enough to get a good feel of the capital, I'd like to show them the city (and mostly around the zona colonial) from both perspectives, both local and touristical.
For their restaurant, they will mainly be catering to business lunches and dinners and middle class & higher locals. Prices and food/menu will be european style, and allthough everyone would be more then welcome, not everyone can afford a european priced meal.
On another note, I will also be showing them several shops and supermarkets, just to reasure them that in this country you really can find everything (sometimes if you look long enough for it). Because as a tourist that has only seen Bavaro, they might believe that the only type of shops are giftshops
Thanks again for the continuous replies. I'm leaving with them for Sto Dgo tomorrow around 1 PM.