Yuma in the summer

Going to San Diego for a few days at the end of June with the FW and staying at Campland.  DW wants to stop in Yuma to see one of her best friends.  Was thinking of going a couple days early so they could hang out for a while.  Looking for recs on parks, especially ones with lots of shade.  I'm also looking for warnings of parks to avoid.

Thanks,
Lyle