Two weekends ago I've been to La Campana National Park. I've read about it and it seemed to be one of the nicest national parks near Santiago. So, I took the bus from Universidad de Santiago terminal (Santiago city), which is right next to the metro station having the same name. The trip took around 2 hours, and I had to be very careful with the stop, becase Olmue (the place where is situated the park) is not the last bus stop.
Regarding the park, it's very well organized, with a guy at the entrance who offers support and informations, with a huge map with all the trails, their difficulty and the time you need for each, bathrooms and an astonishing view of the mountain. The trails are very well marked so very easy to follow.
Another tip: the trails can be made faster than specfied on the panel there. Really. Without being a professional climber / hikker or similar.
I tried the Granizo sector but I've heard that the north part, through Ocoa sector it's much nicer. The tricky thing is that the access is harder to get. Anyway, as a general conclusion, if you want national parks around Santiago, don't miss this one!
PS1: prices? see my picture.
PS2: you want to make the long trail through the La Campana summit? You have to be there pretty early, otherwise they won't let you go
If you own or manage Parque Nacional La Campana, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.