I have this happen regularly. I usually employ some of the scenery pieces and add elements around them. There are lots of small to large scenery buildings that can be made to give the illusion of working buildings by using the configured doors. Set the building, foliage, water, rocks, etc and run path from the zoo walkways up to the front area of the building. One or more squares of path away from the building, place one of the configured doors; there are several decorative ones that look somewhat like a gate. Run decorative or exhibit fencing out from the sides of the door. You don't have to go all around the building, even a few pieces of fencing on each side give the illusion of a fenced in area with a gate. The guests will walk right up to the 'door/gate' and enter. No, you won't see them go directly up to the building, but it's close enough for me. If it look OK, you can put the configured door right up against the side of the building or object. This can work with big rock formations, or you can build your own structure using solid fencing and strategically places trees or other objects/decor to fashion what looks like a building. You can also use some of the exhibit annexes by putting the configured door right up against the building door. This can turn one of the annexes into a restaurant or gift shop or restroom. It's fun to experiment.