Usually finding dungeons takes a lot of cave exploring, but on this map, there are two dungeons on the surface. There’s also a village to gather practical survival goods from if the above ground dungeon loot isn’t what you’re looking for.
When you first spawn you’ll be on the plains, facing the ocean. Turn around to face north and head in that direction. You’ll come to a savanna first, but just beyond, that you should see the desert. That’s where the village and the dungeons sit. As soon as you step into the desert, start going to the left (west).
Minecraft PC 1.11 Seed: 3237152078931188074
Above Ground Dungeon #1
You’ll come to the dungeon at -260 / 61 / -75. It’s a rectangular hole in the sand with cobblestone walls. On the floor of the dungeon, you’ll see three sand blocks that are taller than the rest. Those mark the monster spawner and two chests.
In the chests, you can find redstone, name tags, a saddle, and gold horse armor among a few other less valuable items.
From the dungeon, you should be able to see the desert village across the river. This village isn’t very big, but it still has a butcher shop, library, church, and a few houses. The important thing is that it has plenty of crops for food and villagers to trade with.
Above Ground Dungeon #2
To find the next dungeon, you need to head back east. Continue through the savanna, and you can even take in a savanna plateau M biome as you pass. (You’ll recognize it by the peaks that go above the clouds.)
At 314 / 67 / -14 you’ll find the dungeon that looks very much like the first. Except for this one only has one chest. You can still get iron, a saddle, and more gold horse armor from this one chest.
There’s plenty more of this seed to be explored. Continue to look around and see what else you can find!