How to hide some administer option from all users?
User #1 is special.  This user bypass all access control, so the only way to make sure that no user have access at this level is to disable user #1.  However, disabling user #1 is not a good idea.  At one point, you may need to have access to a special user account that can access all areas in order to fix some serious problem with your site - and in some cases, the all-powerful user #1 is the last resort.

However, you can approach this by creating a second admin user account (name it lesser_admin) and give this user account all the administration rights except Administer users and other rights you want to withhold.  You then stop using user #1 as admin and instead log on as lesser_admin when you (or someone else) want to perform admin tasks.

To make sure, you may give user #1 as very long and impossible to remember password and  write this password down and put in a sealed envelope in a bank vault.  That way, neither you or anyone will have access to the user #1 account.  However, when the day comes when you regret doing this, you can go to the bank vault and retrieve the envelope.