collarfreak:
Which part of the cross-river are you? Anywhere you are, find your way to ikom which is very close to ogoja and a 2hrs drive from Abakaliki.
When you get to ikom, take a bike or a vehicle to ekok which is the Cameroon border though you might settle Nigeria soldiers at any given point before getting to Nigeria/Cameroon border not more than 500naira so you can budget 2k for the settlement. When you get to the border there is just one way to cut our immigration is via boat to cross you because the river is what separates Nigeria and Cameroon but you would have to pay for the boat but very cheap. But if you have your passport and the genuine reason going there, pass through our immigration gate just that you would have to tip them to allow you. N.B there are bad guys at the Nigeria border impersonating immigration once they see you are going for the first time, they would request for your passport and demand for money from you, and if you give at your own risk. you need to be sharp, don't form ajebo, and be observant instead be ready to waste money. Once you find your way to Ekok(Cameroon border) allow the Cameroon immigration to stamp your passport for you which comes with fees because all uniform men in Cameroon are also more corrupt than Nigerians. It is very important you get your passport stamp to avoid their police and control on the highway demanding money from you by seizing your passport. Once your passport is stamped, take a bike to the park still trekable though and when you get to the back you can change your naira to the franc and enter any vehicle going to your destination.
If you have any more questions you can ask me

Please where can I exchange naira to fr on my travel and where is the cheapest way to cross over I am not planning on going into the city I just want to cross exchange and send someone money via momo

Please I want to make a trip to Cameroon I don't have any idea on the whole travel arrangements from which border to use and also cost of travel plus I want to know what is the current exchange rate I really need details please