Lessen caffeine intake, be happy (so you don't cry all the time!), hot baths which clear the sinuses and seem to help my undereyes. I also got my ears candled (a naturopathic treatment) and since then, not only has the fluid/puffiness virtually disappeared, no more recurring sinus infections! Woo!
I have yet to find an eye cream that helps. When they do, it's not for very long.