This is a must.....Very pristine, as yet untouched and just beautiful. Start early. The drive to Aru itself is about 40 minutes or so. The taxi driver normally gives you two hours to look around. That's plenty. Once you get there, hire horses. The costs are fixed and they have a board displaying the amounts. Make sure you wear comfy clothes and shoes. Enjoy the horse-ride. Take your time.
Next proceed to Betaab Valley. Once again, the driver will park the cab and give you an hour to look around.This is more for family outings because people take picnics there. Plenty of areas to set your picnic and enjoy the ambience. We personally preferred Aru over Betaab because it was less commercial and also, we love horses.