What I envision for the Lebreton Flats, Ottawa.

The Lebreton Flats National Park of Canada.

A 2016 photo from centretownbuzz.com.

Why not? Toronto, Ontario has Downsview Park, a decommissioned military base.
Former Members of Parliament John Baird and John Manley want the Lebreton Flats to be transformed into a National Park.
Lebreton is less than a mile from Parliament Hill and it could be designated an Historic Site.
There will be not be any "Private Property" and "No Trespassing" signs. Visitors from all over the world will be invited to visit the museums, view the statues and monuments, enjoy Canada Day celebrations and Bluesfest, walk on the grass and admire trees and flower gardens.
A Tree Preserve or Tree Sanctuary.
The Strawberry Fields Park in Central Park, New York City is a living memorial to John Lennon. 150 nations from around the world donated shrubs, trees, flowers and rocks to the Strawberry Fields Garden of Peace.

The Official Opening of Strawberry Fields,1985.
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When a health care facility takes over the Experimental Farm on Carling Avenue more than 500 mature trees will be clearcut. (Letter to the NCC from former Ottawa mayors Jacquelin Holzman and Jim Durrell regarding the Sir John Carling site:)
     "Hundreds of trees would need to be cut down. Yes, we counted but stopped at 500!" "NCC Federal Site Review for the New Civic Campus of the Ottawa Hospital", October 21, 2016, page 215/256.
Also, the crabapple trees that Isabella Preston planted may have to be removed and Agriculture Canada employees were forced to dig up hedges near the evicted DARA Tennis Club. Abandoned Experimental Farm gardens and trees could be relocated to Lebreton.