Since there is only one episode and two teasers for the second episode, everyone only saw a fraction of Insanity Island (which, if you didn't know, is where the show takes place). I made some specuations for the rest, so here it is.
Pleasant Point - a plains/forest area. I named this one after a fictional place from my K-PREP last year known as "Pleasant Point National Park" (it may be a real park, but I dunno). It's where the cabins are located.
Pesky Praire - A desert/savanna/praire. Just a few cacti but oasises are a bit common.
Ballistic Beach - As you guessed it, it's a beach. Palm/cocunut trees are quite common.
Furious Forest - A forest filled with liquid poison. It's actually based off the forest levels from Super Mario.
Inferior Iceberg - Didn't come up for a good name for this one. Oeiginally it was going to be called "Insanity Iceberg." It is an iceberg filled with a few ice flows and sometimes constantly snowy weather.
Vicious Volcano - It's a volcano, far from Insanity Mountain. It erupts once every ten years.
Wall of Lame - It's actually a suggestion for the 'eliminated contestant prison'. It's located at the far side of the island.
There ya have it.