Take a train from Libreville. From there, you'll have to go to Langouie Bai camp via two hour 4x4 drive and an arduous 8.2 KM walk up a massive hill and through some jungle. This is the only place to stay inside the park so you will need to start early. From there you can set up camp (rememeber, you'll have to bring all your own stuff and no porters are available) and then it's another 4.2 KM to the Bai, that is, the opening for which the park is renowned. A scientific viewing platform is open to visitors interested in checking out local wildlife.