You can get detailed properties of EC2 and RDS: 

You can read the console logs of EC2 instances:

For the running RDS and EC2 instances you can check CPU statistics:

For RDS, you can check the logs available on the AWS side (as you can't access them directly):

And finally, you can browse S2 buckets and files inside - without accessing the files, so no sensitive information can leak, but users can check the existence of a file or a backup: