As far I know, there is an excellent future on Sun Solaris administrator. As a System Administrators, the tasks r to perform essential system administration procedures on the Sun Solaris OS & technical application support staff responsible for administering a networked server running on same OS. Sun offers certifications for the Solaris 8, 9 and 10 OS, each consisting of two exams. It is necessary to pass both part I and part II exams of the same Solaris OS version in order to get certification. Its mostly learning a lot of commands and all the tags that go along with them. Its a LOT of memorization, mainly of those tags. After completing, u may get good offers of good jobs.
Good Luck !