Positivity versus Happiness
Being happy does not mean you are positive. It may just mean that you are simply reacting to external stimulation that makes you happy. Take it away and you are left feeling empty or negative even. Being a positive person will lead to happiness though. If you see the good in every situation, then you will undeniably view and experience things that will make you happy. One will appreciate and enjoy the small things or experiences in life; one will find happiness and satisfaction in every day life instead of ceaselessly yearning for the next "fix" of happiness. Be positive, not just happy.