Lights out and people sleeping create an opportunity for sexual harassers, and the large amounts of unwatched baggage create an opportunity for thieves. Arrange in advance for your hotel to send a car to pick you up at the airport or train station. If he still won't let go, forgo all niceties and raise your voice for everyone within a hundred meters to hear. And they rarely travel alone. If they put their hands in your pockets, it may be necessary to use measured force to get them away.
Distractions are a mainstay of professional criminals, too.
A very helpful man appeared and started to help clean up the mess. Travel light and leave the fine jewelry at home. The less you carry, the less need you have for the help of taxi drivers and others who try to grab your luggage. And the fewer ornaments you display on your person, the less of a target you are. Place your most important documents and credit cards in a cotton pouch you can hang around your neck and wear under your blouse.