Dominican Republic National Zoo is a family-friendly wildlife attraction in Santo Domingo, useful for travelers with children or anyone who wants a relaxed half-day away from churches, plazas, and museums. It is a conventional zoo-style stop, but it fills a real gap in an itinerary.
Go early if heat or crowds are a concern, and check the official source for current hours before committing the trip across town. It is strongest as an easy outing rather than as the defining reason to visit the city.