Speaking of Zhang, there are Beidaying and Shenyang East Station. Peking University Camp has been dismantled by the shameless Shenyang Development and Reform Commission. Shenyang East Railway Station is the original Fenghai Station, which is said to be the earliest self-run railway in China ... You can also have a look if you are interested;
Shenyang is also a city with a relatively rich cultural heritage, focusing on sites and historic sites.
Nanhu Park is actually nothing, and it may be a bit disappointing to go.
If time permits, you can stop by Jilin to see the Songhua River and experience the feeling of blowing the evening breeze by the river at night. Time from Changchun to Jilin 1~2 hours;
Your travel plan is detailed enough that nothing in the book is so practical.