My suggestion is to allow the placement of a new guest walkway type of one-way glass that is only unlocked after unlocking the one-way glass barrier research. The walkway would come with special pre-fab walls to block out sunlight (which could have an option checkbox to toggle on / off). Then the final special piece would be that either the roof would also be pre-fab to block out light while the floor would be one-way glass; or vice versa the floor would be normal and instead the roof would be one-way glass.
Placing this type of walkway in the air over a habitat would count as hard shelter and lower stress levels while giving guests a close look at animals sleeping or other intimate moments. This would make it so guests could literally walk over the top of animals and as long as there is sufficient light in the below area then the animals would have little knowledge of humans being nearby.
Placing this type of walkway under an area would allow them to walk unseen below the animals feet. Incidentally another reason that this usage suggestion might appeal to you as developers is because it would also pave the way for a future marine animals DLC if you were interested in that being a thing. This marine DLC pre-req would be because it would allow a way for zoo paths to be under the level of water without causing obstruction issues. The 'ceiling' one-way glass could simply act as a barrier for the habitat it was underneath - or above in the case of the floor one-way glass. By simply rotating the one-way glass barrier item (counter)clockwise 90 degrees it becomes a usable way of making guest's experiences even more amazing.
Placing this type of walkway in the air over a habitat would count as hard shelter and lower stress levels while giving guests a close look at animals sleeping or other intimate moments. This would make it so guests could literally walk over the top of animals and as long as there is sufficient light in the below area then the animals would have little knowledge of humans being nearby.
Placing this type of walkway under an area would allow them to walk unseen below the animals feet. Incidentally another reason that this usage suggestion might appeal to you as developers is because it would also pave the way for a future marine animals DLC if you were interested in that being a thing. This marine DLC pre-req would be because it would allow a way for zoo paths to be under the level of water without causing obstruction issues. The 'ceiling' one-way glass could simply act as a barrier for the habitat it was underneath - or above in the case of the floor one-way glass. By simply rotating the one-way glass barrier item (counter)clockwise 90 degrees it becomes a usable way of making guest's experiences even more amazing.