I'd avoid the computer game designer thing like the plague due to the recent trend of outsourcing anything computer-related overseas. Even if you can get a job in that field you can bet the salaries are going to drop (if money is a consideration).
Thanks
This thread has been extremely valuable to me. I have decided at a later stage than most to return to school and pursue a physics degree. The info presented here reinforced my confidence in my decision. Thanks, posters!