My dad's trick for beating jet lag is going swimming at the hotel where he lands. I have a hunch there's something about being in standing height or deeper water that triggers your body to stay awake (since you would otherwise drown)
Interesting, I like to go swimming midday or evening and it helps me "reboot" as well. After about 30 minutes of medium to high intensity breaststroke I often feel better than when I got out of bed that morning.