this is ridiculous (sp) i just got this game and i have found way better spots then this!!

if u get in that alien ship in this map u camn jump out onto eihter of the two tallest towers and snipe away!!

also on this level take a banshee up to the top and at the highest points(should be easy to spot, it's next to the less viewable elephant)and time your exit you'll land on top where you can kill all unexpected victims below =] it'll work with and scoped weapon but best with a sniper. and I'm just saying i found this myself so I'm not taking credit for anyone else' work

my above comment refers to sandtrap

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Beachside on Valhalla: A rock on the left of the base you can hop behind and get loads of kills from. And to the right another rocky area in the mountainside, gives a god view of the base and the valley to the edge of the pelican crash.
Mountainside: Left on this base is a rocky outcropping providing some cover when crouched and a good view of your entire base.

Sandtrap: Standing up behind one of the pelican jet things, especially if this is the enemies main spawn point. Hiding in the taller building across from the long ruin with the grav-hammer on it, you can climb up the pieces on the inside and perch in the shadows, kinda like the parts oif the wall you can climb in Narrows. along with the highest sand hill on the right of the building, easy to get cover, just back up a few steps, and you get an amazing view of almost everything.

Last Resort: The shadowy corner of the walkway from the "camp Frohman" sniper spawn to the big building, because they can hop down or climb up into the point with that hole in the walkway. Or the building near the shotgun spawn because its shadowy and has many areas to run and is also out of the way.

Epitaph: The upper walkway at the opposite side of the side with the grav lift that throws you to the floating platform.