#1. Understand that the first few minutes of a hostage-taking situation or an abduction are the most dangerous, and they become more dangerous if you resist. Don't resist and try to remember as many details as you can, even if you are only able to hear things and not see them.
#2. Calm down. Your adrenaline will be pumping, your heart will be pounding, and you will be terrified. The sooner you can regain your composure the better off you will be immediately and in the long run. You can make better decisions when calm.
#3. Ask why you've been abducted. This will provide you with insight about the situation. More importantly, this will engage your abductors, making it harder for them to see you as an object or pawn and not a person.
#4. Try to communicate with other people in the same situation. If others have been taken hostage, see if you can find a way to communicate. The more you know, the better. You may also be able to plan an effective escape together.
#5. Get out of the way. When help arrives you need to protect yourself. Even if your captors are taken by surprise, you could be killed by the actions of police or soldiers, who may use explosives and heavy firepower to enter a building. When a rescue attempt occurs, try to hide from your captors, if possible. Stay low, and protect your head with your hands, or try to get behind some kind of protective barrier (under a desk or table, for example, or in a bathtub). Don't make sudden movements when armed rescuers burst in.
I'm hopeful no one will ever have to use this information, but it is good to have in the back of your mind.
Stay safe out there,