I'm thankful for my family's and my own pretty good health.
Also, my slight advantage of good optimism and the ability to see and understand reality. When you understand reality, you can predict the future a wee bit better than average. If you are looking into the future to see what's going to happen, you can maybe nudge it one way or the other to suit your needs.
Anyhow, I've led a fairly charmed life, and I think it's because of these positive attributes, so I'm thankful for them.