Salcedo is a nice day trip, you can visit the Hermanas Mirabal museum and do La Ruta del Cafe if you want an easy trek in the countryside.
Cambita in San Cristobal for a scenic drive from the capital and lunch at L'Aubergine high up in the mountains.
Altos de Chavon and Cueva de las Maravillas are within comfortable distance for a leisurely day trip and a good lunch. Anything beyond would be less leisurely, IMO.
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