Gears of War 3 - Shattered Paradise

Head up the stairs (after the cutscene) and take out the theron on the ledge. Watch out for the wretches that come out of the door to your left. Once you are clear, head inside. If you head straight across and then right, you'll actually come up on the left flank up ahead. You should have nice easy pickings of the theron from there. Kill them, follow that patio around and back into the shade. Stay in the shade unless you absolutely need to come out and it'll take you right up to a Mauler and then some catapults. Take one and start shooting down the Gas Barges.

Once you've gotten rid of the Barges, you'll be taken inside a hotel. Go up and then take a left and follow the hallway until you can take a right but don't. To the left there is a false tile on the floor. It will look like it has a dark outline around it. Go up to it and hit X to uncover a collectable. This is a sightseeing tour. Follow it around until you see the tree, and then head outside. Either play the stealth game or just head left and steam roll the locust there. The path will loop around until you come to the catapult that was originally on your right. Take that and use it to take out the Reaver on the two buildings. Then use it take out the dam. Once that's destroyed, you'll be back in the hotel. Head up the stairs and turn around to see an angel statue. To the left side of the angel statue are some couches and on a desk between them is a collectable book.

In the next area of the hotel, you'll have to fight. It's mostly theron guards with a mauler. Once you kill them, there are stairs leading up to your right. If you take those, you will have a good vantage point for the locust about to bust through the door. The only problem is the range so if you don't have a longshot, this position might be useless for you. Take out the guards and the bloodmounts. If you're looking at the giant door that they just came through, on the right side, all the way down between the benches and the door you'll find some COG tags.

You'll come to big outdoor plaza. There will be an Armored Kantus here but you will be too far away to do any good at the moment. Flank up the left side and pick up grenades if you need them. Then try and land a grenade from there. Hopefully it will take out some theron so you can rush and shoot the Kantus in the face. Kill him and a few more theron guards will come out of the two small towers flanking the Siege Beast. Clean them up and use the catapult to take out the Barge and then push it into the ocean.