In some societies, men may harass a woman who has no obvious protector. Don't react but get out of the situation. If a police officer is nearby, seek protection. Many travellers are assaulted and robbed after accepting drinks or food that has been spiked with drugs. Invitations to private gambling sessions can lead to rip-offs or worse.
Scammers offer travellers deals that are indeed too good to be true.
You may be approached to take something out of the country or to buy drugs to take out yourself. Don't be a mug. Hitchhiking is very risky, especially for women. Don't present yourself as a rich target. Keep your valuables concealed.