Santiago city has many places very interestings to visit, but it depends of each one tastes. Personally, I like specially places with green areas and trees, and also the viewpoints and places to hold parties or barbecues. Considering this, I should recommend places like the O'Higgins park, that have some(50) artificial lakes and a lot of grass, besides tables and infrastructure for roasts and few drinks. It's also nice the Forestal Park from the commune of Santiago, although there are many police and actually can't be made parties pratically. Another place can be the Alberto Hurtado's Park, but the problem(50) is they charge money at the entrance and the park is increasingly vigilated, so many things are forbidden.
Another nice place is undoubtedly the San Cristobal's Hill, where there are very nice overlooks and also barbecue places (such as "El HermitaƱo"). It is a hill that stands in the middle of(50) Santiago, and from it you can see almost the entire city if there is not much pollution. In all these places, in any case, you can smoke a blunt back and enjoy nature.
I would recommend too the neighborhoods where are plenty nightlife, but just for the pubs which are(50) in them because I don't like discos. In those places, the best know is the Bellavista's neighborhood, where there are many bars, restaurants and discos, and the Brasil's neighborhood, which is the same, but there is a large park where you can enjoy the outdoors(45).
In short, I would rank these places like these:
- O'Higgins's Park
- Alberto Hurtado's Park
- Bellavista's neighborhood
- Brasil's neighborhood
there are all the places that undoubtly the tourist will enjoy, if they have a young spirit.