While I typically use a +Dyson Logos map for my 4-scenario dungeon stocking exercises, I decided to give +matt jackson some love, and mod up his "If you were to follow that river" map accordingly.
The map depicts a portion of a subterranean river, crossed by a bridge (natural or otherwise), with two networks of caverns, plus an island with a small structure. In all cases, I'm assuming downriver is toward the top (north) of the map, and that the cavern surfaces soon past the map. The bridge entry to the west/northwest is close off-map.
So here goes:
Pirate Redoubt: A good ol' root-out-the-pirates scene.
Heretics on Parade: A good ol' root-out-the-heretics scene.
Wyvern Kin: A good ol' root-out-the-wyvern scene.
Secret Seer: A good ol' figure-out-what-the-hell-is-up-with-the-seer scene.
Everything is built out using Swords & Wizardry, but I'm not picky, play however you want :)