[Avoid jetlag and airsickness] Don't draw unwanted attention to yourself
When travelling in some countries, it is best to leave your jewellery at home - the richer you look, the more of a target you'll become for pick-pocketers. You also might want to take one 'nice' outfit in your backpack to blend in with the locals. Wear shorts and hiking boots in cities such as Venice and you stand out like a sore-thumb. And don't forget to spend some time away from the tourist traps - immerse yourself in the local way of life!