In the past, I've written often about the Sakura / Cherry Blossom trees in High Park. Often they've already come and gone by this time, but this year they're delayed by that long, cold winter. Experts predict they won't bloom until mid-May or even later.
If you want regular updates, I recommend this site from an enthusiast who visits High Park far more often than I do these days. We've likely got another three weeks before you can take pictures like these.