I want this but somewhere in forest pls

As for the comment about triangles - If displacements are a bit scary to you, maybe a bit complicated, 3kliksphillip has an excellent short tutorial on how to use them briefly. The only advice that he didn't include is to avoid power 4 displacements where you can as they can cause memory leaks and whatnot.

I'm glad you took the feedback so well. I wish you well in your endeavours with the map and will check in again at some point soon hopefully!
3D skyboxes - What issue were you having? I'm guessing that it was far too low down because it projects from 0, 0, 0, and since the actual sky section is at the top of the grid, it was in the wrong place. The only real fix for this I can think of would be to make the 3D skybox room extend very deep, (Divide the space your map goes up from 0, 0 ,0 by 16 and have it be that tall, with the actual content of the skybox at the top (trees, terrain, etc), and have the sky_camera at the very bottom. I can further explain this if need be.

The ground- I’ll be completely honest I can’t do that without it being a bunch of triangles due to just how new I am to this. I knew my limitations after a while and decided to stick to what I could do at the time, however I would love to return to this map at some point when I have more time and attempt this!
Trees/Shrubs- I completely forgot to even attempt this due to my friends being set on the idea of “giant fall” and me being a bit busy, I will definitely try to add these when I can.
The spawners- I actually did know about that issue but completely forgot to place down other spawners after playtesting with a friend, that’s definitely my fault and like the trees I’ll add it ASAP.
And finally the teleport idea- I never thought of that but will try that! I do want to say more but this comment is getting very long probably so I think I’ll cut it here, thank you again for the great feedback ThenNothing!
(2/2)

Thank you for the feedback ThenNothing! I completely understand why a lot of people would see it as a bad map but maybe a little more info as to why the map is this way will be helpful;

The Sandbox- I actually did attempt to add a 3D skybox at first while following a tutorial but never was able to get it working no matter what I attempted, due to wanting to actually finish this I decided to give up and move onto finishing up the map.
The fence- It’s actually a leftover from said skybox that I grew to like and decided to keep to act as a sort of wall, it looks a lot better being there than just having completely empty space. I never actually thought of a backstory for it but I think I will now when I can!
(1/2)

Another thing: I didn't notice that in the description you had pointed out this map extends from one hammer boundary to the other. To solve this, perhaps halve the tunnel and have a teleport trigger halfway through. Set it to preserve momentum and position to keep it seamless, and have some fog or vision block of some kind to stop the illusion being broken.

Oh, one more thing: There is only 1 spawn point. This means people telefrag eachother when respawning. Duplicate the spawnpoints to get at least 4 of them to avoid this.

To improve, I suggest:
1. Adding a 3D skybox. This can just extend the 'barron wasteland' type look if you like, or can be used to add more detail. There are some great tutorials online if you need help to do this. (Also, increase the height of the sky.
2. Converting the ground into a displacement and changing its texture. I suggest doing this for the cave below too on all sides, giving it a bumpy feel, less a square.
3. The fence - Address why it's there. Are you in some sort of fenced off compound? Perhaps add some towers or decoration to make it more believable. (Also, expand the area, to allow for building and such, something important for gmod.)
4. I suggest adding some shrubs or trees, anything to spice up the landscape.

I understand if you decide not to work further on this map, however I think these improvements would benefit and turn it into something worth playing more than once. Good luck!

Let me provide some feedback here. To be straight up: In my personal opinion, this is not a good map. The choice of floor texture, the fence, the low skybox, and lack of any real detail of any sort makes this map nothing more than a novelty you download once, then unsub from.

Now, on the other hand, some positives; The button to send you back up isn't something I'd expect from this type of map, nor is the nice soundscapes as you fall.

this is terrifying

For someone's first map, it's pretty great! You see maps on the workshop from months ago that have no light_environment that haven't been fixed to this day.
Concept of the map is pretty good, hammer is a difficult tool to master, hate comments come from kids that don't know where their Steam directory is.

holy crap this looks awesome i love the idea of like it being a underground lake i like that alot absolutely awesome job amigo!

Don't listen to Bill, he's just being a butt.
You've done a great job for a first try as you've played around with hammer, testing what tools do what things. Seriously, keep it up! I'd love to see you get better and better!

this sucks

good attempt at a first map, most people dont even know what a light_environment is

This looks interesting