Can I get out of airport in my 3 layovers (Kuming & Shangha) below for sight seeing without visa.

For your return trip to Canada you need a visa as 2 stops limit you to 24h transit time in China.
On your first leg your transit time in China is 12 hours from scheduled arrival time in Shanghai to the scheduled departure time in Kunming?
Then you're fine for the 24h transit and you don't need a visa.
I don't know how long you'll be in Shanghai the first time but there's no guarantee that the immigration will give you a temporary permit.