per Rick Steves: Sunlight beats Jet Lag - so get outside after the long flights. Get Moving, Breathing Outside air. Stay awake until "bed time" local time (this could be earlier than normal the first night).
per Rick Steve: Pickpocket prevention: Be aware of your surroundings, don't be stupid, have a money belt with your "bank" and a wallet with the money you need for the next couple of hours (and be prepared to have it taken).
My experiences:
Jet Lag: From the west coast we typically leave in the early afternoon and arrive in London or Barcelona around noon the next day. Try to sleep a little (well try to sleep a lot, but..) on the plane. We usually can make it to 9 or 10pm local time, then off to bed and we are good to go. We have had several trips and have spent about 2 months total in Europe. Our kids were 14+ and they adapted easily. One tip is about caffeine, try to not have any for 48 hours prior to your flight - Even the sneaky caffeine: in tea or chocolate etc. None on the flight. Then you can partake once you've reached your destination. Oh yea, try to stay hydrated with WATER on your flight.
Pickpockets: Like others have said the pickpockets are VERY GOOD!! You can do everything right and still be a victim.
Moneybelts: Please note: put on your underwear, put on your money belt, put on your pants (skirt, shorts, etc). I have both seen and heard of people wearing their moneybelts on the outside of their clothes!! confused3: That does not protect your money. Also, don't pull it out in public so everyone can see you have one.
Distractions: Where people are distracted, pickpockets are there working. "Fights" breaking out is a typical distraction. in Barcelona, La Ramblas IS a huge distraction, kids wanting you to sign a petition is a distraction. Crowded public transportation - where there's no personal space are prime pickpocket locations. Some buses in Rome have more pickpockets than potential victims. And my pet peeve - there are signs warning tourists about pickpockets and I see people walking past these, read the notice then point everyone in the vicinity to exactly where they are carrying their money. And Yes I am guilty of this as well.