Complete section corresponding NSM
This area is a nature resort. That is, there's quicksand-like snow, giant spiders, man-eating plants, dead trees, and floating balloon-like things I'll refer to as "jellyfish." Anyway, after you parachute in, swing off the farthest end of the tree. You won't die if you fall into the snow; you'll just start sinking. So if/when you land in the snow, slog through it to the right until you can reach the tree on the next piece of land. (See the pictures.)
Once on the next piece of grassy land, swing off the other tree, slog through the snow again, and grab the tree on the next piece of land again. (Forget that parachute item, although there's an easy way to get it...) Now that that's over with, run to the right. KEEP RUNNING! Do NOT stop! Before long, you'll see a man-eating plant erupt behind you. ONCE THAT HAPPENS (and make sure it does happen away from you,) then hook straight up, avoiding the spiders.
From there, move left and hook up onto the platform. Then move left and hook up again to the next platform. KEEP MOVING TO THE LEFTMOST POINT OF EACH PLATFORM, THEN HOOK STRAIGHT UP TO THE NEXT PLATFORM, THEN REPEAT. But how to handle the spiders?
1- Keep shooting them. You can often destroy them even if they don't seem to be right in front of you. Remember that your rocket launcher releases a "fat" bullet/rocket, and they're rather fat spiders, so you can easily get 'em. (Side note: You should be taking the rocket launcher to every level now.) NSM
2- Keep throwing your bionic arm at them. Not only will it effectively drive them back, but they'll be frozen for a second or two before moving again. They're fat spiders, again, so you can easily get 'em. NSM
3- Just keep on moving quickly, only taking care of the spiders when they present an immediate danger. You don't need to waste all of your time killing or shooing away those oversized arachnids; if you keep moving, you can avoid most of them altogether. NSM
Remember: KEEP MOVING TO THE LEFTMOST POINT OF EACH PLATFORM, THEN HOOK STRAIGHT UP TO THE NEXT PLATFORM, THEN REPEAT. This is the easiest way to get past these spiders and plants. Don't get freaked out by the plants either; they take a while to "erupt" after the grass shakes for a few seconds.
Soon, you'll run into the jellyfish gang. These are really easy. You can shoot them (duh,) throw your bionic arm at them, or avoid them, just like the spiders. Notice, however, that even your bionic arm will kill them. And when they (presumably) pop and start falling down after they die, don't be afraid: they can't hurt you while they're falling down like that.
Once up there by the jellyfish, walk quickly to the right and hook up, then hook up again until you're on the same level as that door. Walk into the door, and you're indoors. (This time, it really was cold outside.)
When you're inside, walk to the left and fall right off the platform. After a relatively long descent, you'll end up next to a blue elevator. Be warned: when you step on the elevator, it'll fall really fast. Therefore (and read this before doing it) walk onto the elevator, and as soon as you do, turn to the right again and grab the platform with the bionic arm (see the pictures.) Then swing to the bottom green platform. Fall off, then grab the next platfrom underneath, facing left. Fall onto the below platform, then swing off to the left, and notice two very thin columns. You'll have to swing off those to make it to the boss door, which is way on the left. Good luck!
Once in the boss door, you'll have no problem; it's the Pi Pi Pi defense mechanism. You have the rocket launcher, so you'll quickly destroy both the system and the generator. All right!