Nagua and surrounding area

I feel I have posted so many posts on this board and have received so much valuable information. Thank you to all. But, of course, I have more questions. Maybe because our trip is drawing near. We are staying in Las Galeras on Samana, but we want to be able to leave the resort and enjoy the Dominican Sprit. My map shows that Nagua is within a reasonable amount of time and might make a day trip. Also Sanchez. I have a son who wants to shop for Dominican goods. Any information provided would be appreciated--for Nagua, Sanchez, and any area that would be a good day trip from Las Galeras. Thanks, Mia