When you dont want to rest on the beach all day long I can recomment a ride to San Pedro. There is a nice long beachfront, some colourful wooden houses and a nice church as well as shopping facilities.
15 kilometers further heading to La Romana behind the airport is the Cueva Las Maravillas, an interesting cave that can be visited by a guided tour. The cave was used for spiritual purposes by the Taino aboriginals, so some of their paintings can be seen.
Nice place to stay for a few days. There isnt alot to do except the beach. But its a nice place to relax for a few days.
boca chica is a nice place but like I said before there's needs for improvement they need to focus on the nearby streets to make them much safer travelers especially at nights because not enough street lights there they have a big problem the electricity it goes out for an hour so not good.