Places to take kids in Libreville

Hi everyone, my name is Bronwyn. I'm South African and I've been working in Kenya. In August I'm relocating to Libreville with my family; we have two kids, a twelve-year-old daughter and an eight-year-old son. Any ideas and suggestions as to places we can take them to see and have fun? They love the beach (of course) and enjoy stuff like Oui and Playstation, horse riding and sports like football, basketball, cricket and rounders; bicycling; they want to go to National Parks, and my daughter loves Dance, Theatre and Music.