Container City
-Everyone should know about the hackable door. Not everyone knows that there is a small doorway above it that Lights can reach. From the Security side you can reach it just by B-lining it towards the door and jumping. From Resistance, its a small ledge on the right of the door (I'm not sure, but I think Mediums can reach it from the Resistance side). To add to that, once you're up there, turn towards Security side and there is a small window. I know Lights (maybe Mediums) can get up there, giving them the height advantage, if you do it just right (you might not be able to get all the way into it if you don't hold the SMART long enough, or you might go to far if you hold it for too long).
-This one I found about on another thread, and it's really only useful after the Bot is delivered to the other side by the Crane. From the crane controls cross the bridge, there is a ledge on the left side (if your Security you're going to want to be careful here, Resistance will come out through there) Lights can get up there pretty easily (there is suppose to be a way from Mediums to get up there), but once you're up continue towards the door, just left of that door is a wall you can jump and climb up, turn right and you have a nice sniper position towards the Stair Well, but also merely by turning around, you can shoot at Security crossing the bridge or Resistance trying to stop Security crossing the bridge.
Aquarium
-You can easily reach the back of the door by going right instead of left or straight (actually there is a way to the back from the left side as well, and you can reach the back by sliding behind the pipes). But if you pay attention to the Bots this shouldn't be too hard to figure out (they attack the back of the door more than the front).
-Once you blow up the door, however, there are a few tricks. Firstly from Security you can get into the first bar room three ways (two are obvious), the third requires going a bit of a round about way. Go, right and follow this way either through the maintenance room or hallway, you can either go up the ramp, straight towards stairs (below the ramp) and up the stairs, or immediately left of the ramp and up there is a vent you can get up to pretty easily as a Light or Medium (not sure if Heavies can get up there). Once you get into the second bar room get to the second floor and you can access the elevator. So long as it is damaged you can jump down in the shaft giving you a nice flanking position.
-Another trick, for Security if you get into the second bar room and get up to the second floor. From the command post, facing the MG turn left right, you'll come to a small room, on the right is access to the vent shaft (something Resistance can exploit) and to the left you can look down at the MG nest there giving a nice flanking position.
-One more. Facing the MG nest on the second floor of the second bar room, turn around and there is a ledge that leads outside. Resistance can use that to try for a last ditch attack at Security and the hostage, Security can use it to get behind the Resistance blocking the door. You can also get up to the ledge by climbing the deployable cover walls, or the weapon locker.
Shipyard
-From Security, and this is more useful if the walls are up. Using a Light body, facing the main barricade, turn right and there should be a little door, go inside till you see two crates stacked on one another (they say "82 CFL" on them) you can climb up there and facing again towards the barricade there should be a ledge you can jump to. Resistance can reach this easier from the otherside just past the crane controls. You can climb up, turn right, climb up and you'll be on that ledge. Facing away from the barricade is a small window that overlooks the repair node (and coincidentally the node for the HE Charge). I'm actually surprised that not more people know about this spot.
-Going the same way as the previous go past the crates and you'll come to a ledge that leads to the side barricade. Do a wall run and jump and you'll land on the other side of the ledge. This gives you a nice flank position. Run all the way to the crane and jump and you can get on top of the crane. Run and jump right and you'll find yourself next to the door that Resistance love coming out of. Go ahead, drop a turret while you're up here, or maybe a mine.
-While we're up here, Resistance, you can get to that ledge we were running on earlier as well. You'll get nice cover a good position to shoot anyone trying to repair the Crane. Just be careful because if anyone uses the previous trick they'll run right into you. You can also shoot at people trying to set HE Charges on the Side Barricade from here.
-I actually don't know any really good spots for the second part. But do know, once you get the bridge up, a neat little trick, instead of going across the bridge and going through the main hall towards the objective, run straight into the side hallway, follow that hallway, and you can flank people guarding the way to the objective.
Security Tower
-A cute little trick that Resistance can use, and Security later. As you're going to the first objective and you get to the first wall turn left. There are two ledges, you can get to the top one pretty easily. Go towards the first ledge, turn left towards the cover, climb up ontop of it, turn right and climp up on that power box (?). From here you can jump onto the ledge. You can get to the ledge on the opposite side of the entrance, but that requires just a lot of running and jumping (and I'm not sure if you can do it without a Light body). BTW, if you're confident your team can get the first objective done without your help, you can get to the first command post using that ledge. Just wait till the demo charge goes off and the doors will open for you. If you're quick enough you should be able to get both command posts in 30 seconds (sans the upgrades)
-Once the doors are open. From the main entrance to the main building go upstairs, follow the path to the other set of stairs, instead of going down those stairs go left, go straight to the wall, turn right and run and jump against the wall to reach the other side, turn back towards the stairs and continues till you get to a mattress. This is a good flanking position for the Resistances till you get the pilot out of the medical center, and a good flanking position for the Security once the pilot is out. (I learned about this one from Youtube.)
I don't know much for the other once really. Plus I'm a little tired of writing. I do know a cool ledge you can jump to from Resistance's side in Resort.

