Hey SpiderLink,
I can understand, that you feel bored by those answers, but sometimes it just really are little things, that can make you happy.
But first of all, you will have to try and find out what generally makes you happy and what doesn't. A walk can maybe be bad for you, since the silence makes you get lost in your bad thoughts, so I like to go to a crowded city, where you don't even get to think about anything, since there is so much happening right in front of you. On one side you see a cute girl / boy, on the other side you see someone playing an instrument, while someone else behind you gets hit by the crap of a bird, what makes you laugh. Then you decide to get some ice cream and wander around, until you see the best looking shirt you have ever seen and just buy it.
You go into bed thinking about how nice and funny this day was, while being excited to wear that new shirt tomorrow.
This is just an example, but that's something that would make me happy.
Of course this can not be done everyday, but even when you're busy, you can just think about how nice this day was.
Best of luck! :)