GOING FORM ISLAMABAD TO MURREE: If you don't have own conveyance, hire priveate car/taxi from Faiz Abad Bus Stand, Rawalpindi. Find if any Murree based driver is there, because they must have to go back anyway. So they charge less. (May be because they will try to take you to their own hotel) Normal Taxi/Private Car fare is Rs. 700 plus. But you can bargain with Murree drivers to Rs. 300-350.
While going from Murree to Nathiagali, Ayubia etc. Prefer taxi/car recommended by your HOTEL management. It will be helpful and driver will serve you as GUIDE too. Normal Private Car charges for a full day to Nathiagali & Ayubia are around Rs. 1500/- & to New Murree/Patriata are Rs. 800/- to 1000/-