How do I get logs/details of ansible-playbook module executions?

How do I get logs/details of ansible-playbook module executions?

Say I execute the following.
$ cat test.sh
#!/bin/bash
echo Hello World
exit 0
$ cat Hello.yml
---
- hosts: MyTestHost
tasks:
- name: Hello yourself
script: test.sh
$ ansible-playbook Hello.yml
PLAY [MyTestHost]
****************************************************************
GATHERING FACTS
***************************************************************
ok: [MyTestHost]
TASK: [Hello yourself]
********************************************************
ok: [MyTestHost]
PLAY RECAP
********************************************************************
MyTestHost : ok=2 changed=0 unreachable=0
failed=0
$
I know for sure that it was successful.
Where/how do I see the "Hello World" echo'ed/printed by my script on the
remote host (MyTestHost)? Or the return/exit code of script?
My research shows me it would be possible to write a plugin to intercept
module execution callbacks or something on those lines and write a log
file. I would prefer to not waste my time with that.
E.g. something like the stdout in below (note that I'm running ansible and
not ansible-playbook):
$ ansible plabb54 -i
/project/plab/svn/plab-maintenance/ansible/plab_hosts.txt -m script -a
./test.sh
plabb54 | success >> {
"rc": 0,
"stderr": "",
"stdout": "Hello World\n"
}
$