A.
I wanted to know what custom scenery this bathroom is in, and whether it is JUST custom scenery or peeps can actually "use" it. And if you don't know but you have a bathroom CS similar, tell me what it is.

B. I need some inspiration on some park entrances. I don't know what I should do for my entrance, and whenever I work on a park, I get frustrated and quit after. Any pics of your RCT3 entrances or some real park entrances would be great

Well for the park entrance try making some fountains at the start of it. Make "toll booths" for the peeps to come in.

Add a fountain, lake or statues and toll booth at the start. And the toilets are usable if you put toilets in the actual building, for scenery I'd say ShyGuy's Main Street, but not sure which set.