You could divide it into 2, so each is 3' x 2' x 18", then you could keep snakes, Gecko's etc.. in it. That size would happily house a Corn snake, a Royal, a Dwarf Boa, Milk snake, Hognose etc.. Or keep it as it is & keep one of the Arborial species in it.
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CB10 GRANITE ORANGE GHOST ROYAL PYTHON MALE FOR SALE £275 (2 gene snake), PM me if interested. ON HOLD, Deposit paid.
Most morelias really. Off the top of my head i am struggling to think of other arboreal snakes.
Our IJCP loves its arboreal viv. 2ft wide 3ft high 1.5ft deep. IJ's grow to around 5ft max though, and some of the non-dwarf species of morelia can reach around 8ft so you might be on the small side with 3x4, not sure, try the snake section and ask there. Plenty of morelia lovers on here that'll point you in the right direction i'm sure
mate if i was you personally i would keep a small colony of green or brown anoles in there i have 6 brown anoles in a 4 foot tall 3.5 foot wide and 2 foot deep viv its all natural with real plants and looks f****** brilliant anoles are also peanuts less than 10 pound each and there very active do some research on them they only grow very small aswell if you want send me a message and il send you some piks of my viv to give you some ideas
mate if i was you personally i would keep a small colony of green or brown anoles in there i have 6 brown anoles in a 4 foot tall 3.5 foot wide and 2 foot deep viv its all natural with real plants and looks f****** brilliant anoles are also peanuts less than 10 pound each and there very active do some research on them they only grow very small aswell if you want send me a message and il send you some piks of my viv to give you some ideas