ScreamRide

The best level for this is the last Demo Expert campaign level. You'll have to destroy every building in the level. I believe you need 2,450,000 to 5 star this level.
A few hints for this level:
Throw a bouncing pod through the square hole and bounce it over to the building in the corner. You'll have to keep as low a trajectory as possible and push forward for after-touch from the moment you release the pod. If done right, the pod will just barely reach an explosive container. You probably want this to be your first shot.
Use a regular pod to go through the hoop in front of you when the level starts and roll it through the "metal" ramp to blow up the building.
One of the buildings in a corner is hard to destroy (it's mostly iron with one edge of white), so use the explosive pod.

Also see the first comment from gomuhimo RSC about blowing up the boat.

As others have said, this is possible on the final Demo Expert level.

I pieced together information and experimented to come up with a solution that got me 2.6m with one unused cabin. Here's a vid of my run and a written breakdown:
I started with the capsule that can be split as that was my most inconsistent throw. You need to bounce it off a trampoline and towards a four leg structure, taking out one of the legs and hoping that the building collapses in such a way that the nearby structure is destroyed as well. I'd restart if I didn't get this result.

I'd next throw an explosive cabin towards the magnet to the right of the largest structure, bouncing off the trampoline to reach the magnet. Then aim for the T-shaped part of the right leg and as soon as the speedboat goes behind the second back pillar, shoot the cabin and hold forward. This should destroy the large structure and the speedboat and the collapse should destroy the left and right structures as well. This isn't a guaranteed result so you should restart if everything doesn't get destroyed properly.

Bouncing cabins next. The throw to the first magnet was a pain in the ass and I missed it more times than I'd care to admit. You can throw straight from this magnet to hit the right side of the right leg of the two legged structure which should cause the whole thing to collapse.

Throw the second bouncing cabin to the nearby magnet, then over to the magnet straight ahead and slightly to the right. From here, launch towards the structure just to the right of the direction this magnet is facing and try to hit near the base of the support beam.

Next, we use the coasting cabin on a tall, well protected structure beyond the second magnet that we just used. You can throw directly to this magnet, then aim into the air and launch the cabin in such a way that it arcs over the walls and down through the opening in the middle to hit explosives at the bottom and demolish the structure.

Now we have three throws with standard cabins that can be rolled after landing. I skipped the first path to throw/roll a capsule down the next path through four bulls eyes and into an explosive barrel at the base of a tower.

To the left is another path blocked by a sturdy wall with a central opening. You can throw through this opening or over the entire wall and land on the platform beyond, then carefully roll along to reach the large structure at the end. The key here is to roll through the center of this structure and into the large explosive tank in back, which will launch cars into explosive barrels and destroy both buildings.

The final throw is a basic roll down a path, past a hoop, and into a barrel on the left side of the final platform. I opted to just roll past the hoop without making contact as the resulting impact was inconsistent and would sometimes knock me off the platform. You can definitely roll up the hill and into the bulls eye before rolling into the explosive tank on the left but I knew I would hit the score target so I didn't take any chances.

I still had one explosive cabin left that I never really found a consistent and good use for. I had tried bouncing off a trampoline out in the water to the left of the path with the four bulls eyes and then redirecting slightly right to a platform with two similar, mostly brown structures, but it was difficult to get the trajectory to result in destroying both. Since I had reached the target score I didn't even bother trying to make the throw.

With a little practice, this shouldn't be too bad, especially since you can see exactly how I lined things up. Good luck.

Hi just want to give a step by step solution of what I did for those seeking more detailed information. We will start with the giant building (your starting view) and go counter clockwise.

-Switch to the bomb cabin and destroy the giant 3 piece structure while also destroying the boat. For a video showing how to destroy the boat check here: Thanks to gormuhimo RSC for the vid.

-Switch to the cabin that splits into three, use the trampoline in front and take out closest leg of the 4 legged structure. If your lucky knocking this down will also knock down the smaller structure to the right of it,

-Switch to the cabin that you can roll around on the ground, Make your way down knock out the ring go through the opening and knock into the explosive on the left.

-Keep the roll cabin and make your way going through all the bull-eyes hitting the explosive at the end,

-Switch to explosive cabin use the trampoline to the left and go right towards the two mostly rusted iron towers. Try and land in the middle.

-Switch to roll cabin. at 2 power toss it through the opening in the iron in front of you roll all the way down, knock into explosive

-Switch to bouncy cabin. Get to the magnet close in front of you, I used 2 power for this magnet. throw the cabin to the next magnet in front of you and slightly to the right. Throw the cabin to the big building standing on single rust & white column. Sometimes it won't go down you just have to shoot the cabin as far as you can.

-Bouncy cabin. Same two magnets as above and nail the left leg, try to target towards the left of the leg. Sometimes it also doesn't go down.

-Flying cabin, same two magnets as above. you want to fly this cabin on top of this structure and go inside it from above, there's a shit ton of explosives at the base and this is the only way I was able to get to them

NOTE: In the 2nd step I'm not sure if I knocked down the "lucky" structure during my Dayum run. I was just so fucking happy I got the cheevo and didn't bother scouting the playing field.

Hope this helps.