Depending on the time of day (hopefully before it gets really dark), you can expect to pay $30 USD for a taxi.
If you go outside the airport, the taxis are waiting. Tell them where you want to go and ask the price FIRST. If they tell you more than $30, then tell them no..... Tell them that you will look for another taxi who will do it for $30...... They will then agree to take you.
Enjoy your trip!