Don't know if this is the hotel that Dolores is referring to but I stayed here and it was wonderful.. Lovely small A frames high up on a hill, great pool, good food, great hosts. *no tv
Love the idea of having the hotel arrange for a boat out to the Cayos,
Hostal San Fernando (Dominican Republic/Monte Cristi) - Hostel Reviews - TripAdvisor
I arranged for a boat to take us to a platform in the mangroves and come back for us in three hours but found out that there was no ladder.. oops..
The beach at El Moro is impressive but waves are high,
But I imagine that going out to one of the beaches on the Cays would be great,
there is also a little marina. yacht club there and there might be a sport fisherman who would take you out on a longer trip.
Warning. Bring mosquito repellent. Even though they will not bother you much at the San Fernando.. the mosquitos in Monte Christi have organized themselves into battalions. Maybe a border patrol.
There is a good french restaurant in town.
And go over to Pepe Salcedo, Manzanillo,,, where there is also a good fish restaurant (only one in town) and then you can walk over to the edge of the Massacre River where it comes out into the sand flats by the sea and swim in it. Current is not strong and the water is gorgeous.
There is also a high mountain road outside of Dajabon which goes to a gorgeous monument, thought it was called Capatillo, but googled to no avail. It is a beautiful monument to the liberation of the country from Spain. Real serenity.
If you only have four days, I would not try for Pedernales from Santiago. It is about 6 hours from SD and about three hours of that is cactus. And for me, the road and the area does not get to be nice until south of Barahona,, which in an of itself is just a busy city with one good restaurant.
Also, whether going to Monte Christe or Pedernales, make sure that you take your passports (perhaps copies will do if you are all obviously pale faced) because there are lots of Border Checks.. No worries. They are not shake downs in any way.