Torches. Torches everywhere. I want this map to be a bigger fire hazard than Texas on the 4th of July. Put them in nooks, crannies, tunnels, overhangs, chambers, caves, crevasses, rooms, archways, shadows, shade, windows, pits, traps, corridors, hallways, spawns, houses, shacks, shanties, catacombs, debris, detritus, details, gates, hollows, alcoves, blind corners, caverns, doorways, enclosures, frames, gantries, hideaways, interiors, juxtapositions, keeps, lobbies, murder holes, niches, openings, pillars, quick drops, recesses, slopes, transitions, underpasses, vacancies, x-roads, your map, and zoos. Torches EVERYWHERE.
Oh, and don't forget to light some of them.