This tree with flowers on the trunk.
What kind?
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That looks a lot like the tree we have in our garden, and I believe that is a Japanese Cherry.
Definitely Japanese Cherry. I live near a bunch of these and they look just like this
https://en.wikipedia.org/wiki/Prunus_serrulata
They are beautiful.
There are parks in Japan that have a ton of the trees in the same park, so when the petals fall there are so many that they make a carpet over the water