> Mars seems more like a high boredom environment.

Something tells me that the first few thousand people sent to Mars won't be bored. There will be tons of things to do in the pursuit of making a habitable space.

Besides that, you have the constant death factor. I know we all live with risk 24/7. But, unless we're doing something outside our comfort zone, our brains largely ignore it. Living on Mars will not be like that for a settler. There are real risks that some piece of equipment will fail and kill you all. You'll likely be well aware of that because you'll be working on it. (Or worse, that idiot over there holding the spanner the wrong way is working on it.)