Create difference users is a solution, but make every body loose time to login and logout.
MySafe let you keep all your secrets safe, and share the rest of your Mac.
Mysafe create a Virtual external drive protected with password. (the safe)
Mysafe hide inside it your secret folders from spotlight and Finder.
Mysafe send you a mail with iSight capture in case of intrusion in the safe.
Additional useful features:
You don't need to place MySafe in the Application folder.
You can have as many MySafe with different passwords and options on the same Mac.
You can rename MySafe as you like to hide that you hide.
You can place a MySafe in your DropBox, to access your secret files on all your mac.
You can secure your entire DropBox
You can place a MySafe on a USB key or on a Hard drive.
License is required for those option, but license is FREE if you a "like" and a comment on FaceBook or YouTube.
Choose the size of your safe.
Choose a different name for your safe, if you have more than one MySafe on the same Mac.
Choose a standard folder skin for MySafe to hide that you hide.
Remove iSight snapshot to use it on MacMini
Chose to receive mail notification when somebody try to open the safe without success.
Chose to receive mail notification when every time the safe has been opened.
Create a Virtual external drive protected with password. (the safe)
Hide inside it your secret folders from spotlight and Finder.
Receive a mail with iSight capture in case of intrusion in the safe.