In need of more greenery

Right now,  I live in a big city.  There are many city's parcs in my area.  I find it nice.  I had been in many of them, just to sit there, to relax and get inspired.  What I find lacking is the trees.  I don't find there is enough trees in city's parcs.  They seems to be a bit apart and don't always cover much of the parc, compared to the grass.  Grasses seems to be more everywhere.  I don't need the parcs to be like the forest like on this photo:

It could be something more surrounding, where we don't see that we are surrounded by streets.  Or something that could be less sanitized and manucured parc.  There could be a part that look a bit like that:

I think that I enjoyed taking forested area.  I had found it refreshing.  It is where I also thought that cities' parcs are a bit tame or timid compared to forest.  The parcs that are a bit wilder isn't that much accessable in my area.  Well, they are a little bit far and they are more near a river.  I don't necessarly want to get close to a body of water.   I better like the woody part of those places.  I haven't found the perfect balance for a city's parc yet.