Please plan your itinrary like this
Islamabad>> Chilas >>Rai Kot (Park your car here, Jeep will drop you at last village " Tato " charges will be 6,000 return package) >> Fairy meadows (3--4 hours trek (Stay for a day or two as you wish) <<< Raikot >> Astore (Approx 5-6 hours drive) >>> Chilam chowki (1 Hour drive by your own car, park your car here) >>> Devsai (Approx 3 hours beautiful Jeep drive, stay at " Bara Pani " which is mid point of Devsai between Astore and Skardu) << chilam Chowki << Astore and return back.
Then if you have time / Bedget go for Skardu