Do not take a nap after landing because this will make your adjustment to the new time zone even harder.
Go outdoors and sit or walk in the sunshine this will help with setting your internal clock.
If you normally exercise be sure to keep it up at your new destination. Exercise has been found to help reduce the symptoms of jet lag by days, meaning you don’t suffer as long as a non-exerciser may.
Live by your time zone clock if possible. This will be easier accomplished if you are on vacation instead of business.
If you are traveling for business try to arrive a few days ahead of schedule because this will give you some extra time to adjust to the new time zone.
Usually the rule of thumb is one day of adjustment period to each time zone crossed. So if you cross 3 time zones 3 days should be enough adjustment time for your body to be able to function efficiently.
Cut down on caffeine a few days before your trip and resume your regular coffee drinking regime after you land in your new destination by doing this you can help reset your bodies internal clock.
Above all else rest, relax, and enjoy your trip.