Set up FileVault to keep that Home folder secure.

Mac OS X is highly secure, but only if you lock it down properly. To keep the data on your MacBook from falling into the wrong hands, turn on FileVault by clicking System Preferences > Security > FileVault. Click Set Master Password and then Turn On FileVault. All of the files in your home folder will now be heavily encrypted and password protected. Just don’t forget that password, because if you lose it, there’s no way to access your data—none.