Well like, bottom of the map, like if you go way to down you'll suicide, but dont make it so low that you can suicide.
I'd say make it go to some vent or something, sorta like the basement for mansion.
Hmm. I don't think I will make vents in this map.
What I might do is decorate the bottom of the bridge a bit so you can stand on it for medding/hiding idk..