Jim: Here is an adventerous possibility.
Get to Samaná as early as possible--long drive from Juan Dolio--and go to the area near the "churcha"--the old Methodist church inthe middle of town. Look for someone very dark and ask in English if they know of any apartments for rent for the weekend. You might ask for Doña Efigenia or her daughter. She used to rent us apartments....they have three bedrooms and complete kitchens. Basic, rustic public housing, but fine for a weekend!
That should take care of things.
If not, go out the road to Las Galeras, and stop at La Tambora. They have nice cottages there.
Finally you might try
www.elmarineque.com and talk to AndyB or Nicole.
They might have some space for you... You have to hit one of the three.
We never made arrangements...and we had three young boys with us...
See the whales!!!!!!!!!!!
HB