It is worth mentioning that like most African nations there are some areas where you should be more careful about traveling.
There is some serious civil unrest in both the North, in the predominantly Muslim area, and in the South where the indigenous people are fighting for a greater share of the nation's oil revenue.
To be safe it is worth checking the US State Department's travel page for current update and alerts.
Borno state and Yobe state in the north of Nigeria are to be avoided at all costs because of the terrorist activities of an Islamic group called Boko Haram - kidnappings and other terrorist activities are far too common to risk travel to either of these states.
It seems very simple until you are involved in a relationship, so take some time to understand the culture before you get serious about a sexy African girl.