There's so many things, but probably the best piece of advice I learned from the boards was the advice about using expired Fastpasses. If we missed the closing time on a Fastpass (because we were eating, in line for another ride, etc) then we would just throw the Fastpass away or keep it for the scrapbook. But this last trip we used expired Fastpasses quite frequently and the CMs took them every time, without question. I still feel a little guilty when I do this (like I am breaking the rules), but evidently it's policy to accept them anytime past the starting time, and it's saved on so much waiting and running across the parks to make FP times