It does cost a few dollars to enter the area where the monument sits, and it's worth the price. While the monument is very nice, it's worth walking around a bit to enjoy the view of the cities as well. This is probably the best view of Islamabad you'll get without climbing up the Margalla hills. This is a very popular place for locals to visit, however not as many foreign travelers come here. This means you'll likely get stopped a few times to talk with some of the locals, as well as take a picture or two. Most of the locals will be friendly and will leave you alone if you ask, however some might be a little more pushy. The trick is to push back and insist that they leave you alone.
This is not a religious site, so you won't have to worry about covering your head if you're a woman, or removing your shoes. For the most part this site is used as a picnic site and for simple walks outdoors.
Later