How do you approach analyzing a new Salesforce org?

Hi all,

I am the new admin for a Salesforce org and am curious about how you fellow Admins go about starting/analyzing a new (operating) Salesforce environment. 

My current plan:

• Review Security - Run Health Check, check any inactive users/licenses, review the current setup on roles/profiles, hierarchies, permission sets.
• Review Objects - Review usage of Standard/Custom Objects, # of records and their relevance, get a feel for validation rules, record types etc.
• 3rd Party Uses/Installed Packages - see if any packages lost relevance or would benefit from being removed

Anything I should add to my list on any other general strategies on how to approach getting started in a new Salesforce org?

Thanks!

Thomas