Go directly to jail. Do not pass GO. Do not collect $200.
Various hacking activities may be punishable by law in various countries. Make sure you do not do anything that will land you in jail.
Good intentions do not suffice - breaking in, or even probing, may still be a transgression even if it is done just in order to detect weaknesses and tell the system administrator about it.
Attack your own computers, or obtain the system administrators written permission beforehand.
People are sent to jail, or get huge fines, for "doing nothing".
However, always keep in mind that cleaning up after a break-in, reinstalling the operating system, carefully checking all files and data bases, is a time-consuming and expensive operation. Even when nothing was done the damage may be large.