(Dog) Walks on the edge of town (Bucharest)

Firstly, as we all know the parks in Bucharest are fantastic but, at the weekend we'd like to go for some longer strolls with our dog without having to drive too far.

We recently went to the abandoned reservoir or 'The Bucharest Delta' which was great but we'd like some more options.

We live out past Cora Pantelimon so access to the ring road is quick, has anybody been anywhere they've enjoyed thats less than 30m outside the city or on the edge even?