You're extremely lucky to see the mandrills and hogs in such close proximity, yet you're disappointed not having seen the De Brazza's monkey! Meanwhile every time I visit, the De Brazza's monkey and red river hogs are always hiding in the back and the mandrills are no where to be found! Thanks for the great pictures, Zebraduiker!
Though most of Beardsley's exhibit for Chacoan Peccaries is a boardwalk with glass viewing, there are some actual ground level glass-fronted viewing for them. http://www.zoochat.com/1133/chacoan-peccary-exhibit-225497/
If you look near the end of the fence, you can kind of see glass-fronted viewing at ground level.