I would echo all of the sentiments here. However, I have not found that eating a meal on the plane disturbs my sleep patterns too much, but YMMV...

As for naps, I have not found it counterproductive to take a "quickie" upon arrival (I'm thinking specifically of eastbound flights). By quickie, I recommend nothing over 45 minutes. In fact, 15-20 minutes is the perfect time to feel refreshed for most of the day -- it can keep me going at least until 9-10PM. Anything over that 15-20 minute nap and I typically am groggy unless I get my heart-rate up and some fresh air. The suggestion about sun was a good one -- this helps to reset the body clock during the day. Try not to stay indoors, but keep your body active and your mind focused! Don't sleep in too late the next morning either. It will be hell to get out of bed, but you owe it to yourself!