- Castello
- Sant'Elena
Venice is short of grass. The public gardens at the eastern end of Castello are the exception, and they are why this gazette is willing to use the word park. They are civic ground, not a palace lawn.

Giardini della Biennale
Napoleon ordered public gardens here in the first years of the nineteenth century. Houses and a church came down to make the space. In 1895 the city opened the International Art Exhibition. National pavilions followed, a small world's fair in brick, stone and later concrete, scattered under plane trees and pines.
In odd-numbered years the art Biennale fills them. In even years architecture takes over. Outside those seasons the gardens stay open as a park. The vaporetto stop is Giardini. Via Garibaldi is the walk from the Arsenale. You can sit on a bench here and not be in anyone's photograph, which is rarer than it should be.
Sant'Elena and the Parco delle Rimembranze

Sant'Elena is the eastern tip, partly reclaimed. The Parco delle Rimembranze was planted after the First World War as a memorial park. Pines, gravel, a view to the Lido. Locals jog here. The football stadium sits next door. The church of Sant'Elena is Gothic, quiet, and usually empty. A vaporetto stop of the same name is the last call before the boat turns back toward San Marco.
Other public green
Giardini Papadopoli, near Piazzale Roma, is a small fenced garden that helps if you have an hour before a bus. Savorgnan in Cannaregio is a neighbourhood park behind walls. The Giardini Reali, tucked behind the Procuratie Nuove, reopened after restoration as a short formal garden by the water. None of these replace a proper park. They are pockets. For a long walk under trees, Sant'Elena is the one that behaves like a park in the ordinary sense.

The Zattere and the Fondamente Nove are the linear public spaces. Stone, water, a parapet. If you came looking for lawns, you will be happier in the Giardini. If you came looking for air, walk those quays at blue hour, when the stone goes cool and the boats start to show their lights.