I try to appreciate life however I can. To be really honest, life is beautiful. There are just some obstacles that people would have to cross through, and they tend to blame life due to these obstacles(I know, I used to/still do that sometimes, too). But I realize that I can't keep blaming life for putting obstacles in my path when I'm the one thats supposed to be clearing those obstacles in the first place.
After you've gone through all the challenges life can pretty much give you, you start to see the real beauty of it. If you've lived a nice life, have a career that you enjoy, and retire a flipping millionaire, you start to see the more relaxing side of life, and you start to appreciate it more, and thanking yourself that you've gone through and you did what's necessary so that, in the end, you surpassed what life could give you and rose out on top of everyone else.
That's my view, though. I struggle a lot, but I don't plan to give up anytime soon.