It's not hard to find tranquility in Miraflor. It's actually hard to NOT find tranquility.
Located outside of the city of Estelí, Miraflor is a beautiful nature reserve that encompasses three distinct climate zones, an amazing amount of agriculture, and is home to a great many families.
Finca Neblina del Bosque is a beautiful eco-lodge (both the lodge itself and the surroundings) located within Miraflor. The owners, who I had the pleasure of meeting, are excellent and happy to help.
From the lodge, which offers yummy food straight from their farm, you can do any number of hikes including one to the private swimming pools of Pozo la Pila, an orchid garden (best visited during or right after the rainy season) or a waterfall. Finca Neblina can arrange guided tours and even tours on horseback. It's a must visit when in Nicaragua.