Piste Mataroni
This was the first of the 'forestry roads' I visited (by this I mean sites where there's either active forestry or has been in the past). I was a bit slow getting there, which may have been a factor with the birding, which was very slow. There were no bird flocks, no fruiting trees and very few birds singing or calling. This was a pattern repeated at all the other forestry roads I visited. I looked for White-throated Pewee but, although I briefly glimpsed something that looked promising, I didn't find it.
Camp Bonaventure
I stayed at Camp Bonaventure for three nights. Note that if you want to stay here, you should email bonaventure.belizon@gmail.com. I got the small two-person carbet, which was fine. I just about got used to sleeping in a hammock! As Josh mentions, it can get surprisingly cold at night, so a blanket might be helpful. Something else to note is there is no available wifi at Bonaventure and I couldn't get a data signal for many miles. That made it a bit hard to do lists and to look for info (and I lost my Wordle streak!). I mostly birded fairly near the camp. Like Josh, I spent a fair bit of time on the Marais Trail and some of the shorter trails around the camp. Note that, although the Marais Trail is not too difficult, it's very wet in places. A pair of rubber boots will be helpful. Good birds in these areas were Band-tailed Antshrike (two females and a male were very easy near the start of the Marais Trail), Black-throated Antshrike, Ferruginous-backed Antbird (gorgeous bird!), Musician Wren, Black-faced Hawk (seen well near the entrance road end of the Marais Trail), Capuchinbird (in exactly the area Josh mentions for them), Red-necked Woodpecker, Spotted and Thrush-like Antpittas, Marail Guan, Golden-spangled Piculet, Chestnut Woodpecker, Guianan Warbling Antbird, and Riverbank Warbler. The biggest disappointment was with nightbirding. I tried along the entrance road but there was absolutely nothing calling or responding. I actually didn't even hear a single species of owl in French Guiana. The only nightbirds at Bonaventure were a couple of Short-tailed Nighthawks around the camp at dusk.
Here are a few pictures from the sites I've mentioned so far.