I do not believe you get mountain bonuses with the Maya for the UB. I read your post and had to check, but unless the help is wrong the bonuses are gone. Still, I have managed to put one between two plantations and 4 fields...
Yeah, you're right, just double checked in game (my bad). Still, you can get some really sizable Science bonuses quite early if you can get them next to a bunch of farms/planations. I'm still finding that I keep having to push housing and it takes away a lot of the advantage that Maya gets. Anyone else had any luck getting around the housing issue with Maya? Even the Granary only gets you so far.