The Music Garden is a wonderful oasis right inside the city. It has a beautiful layout of areas that represent various musical/dance forms based on a 'cello suite by J.S. Bach.
I was one of the few musicians that got to play along with Mr. Ma during the gala opening of this park. A few years later I moved into the area and it's been something I visit many times a week all year long. (And no, this isn't because the dog takes me there!) I have had the opportunity to perform twice over the years and many of my friends have performed here as well.
There are many secluded places to sit and enjoy the plant life and a couple larger open areas where there is a summer music series produced by the Harbourfront Centre with help from a few others.
There are seasonal plants all throughout spring, summer and fall. Many items are fixed and many are changed over the years so it's always lovely.