If you wanna stay close, goto this place near Ayubia, I forgot the name, but its not too far from Ayubia, and the name starts with K, and it comes under NWFP. aargh, I cant believe I forgot the name! The only thing you gotta watch out is that theres alot of monkeys over there at this time of the year. Its beautiful, NATURALLY green, and amazing weather. The weather in Islamabad today was amazing, and thats the sort of weather you can really enjoy, as far as the hill stations near Islamabad are concerned.
Spock, Are you talking about Kuza Gali? That's where there are alot of monkeys. And it comes under NWFP.
And Afro, drive past Murree further towards NWFP. You'll love each and every sight while you're driving. All these places are also safe to visit. But be careful while driving because the track gets much more smaller as you reach NWFP so it's harder to drive. At some of the spots of the track, there is space for only one car to go at a time so when there are two (because it's a two way track, anyway), one car has to wait until the other one has passed. So the driver has to be very cool headed and not in a rush to pass first which could be dangerous.