The closest environment to that of Mars is the top of Everest. Let’s see them put a settlement there at the top of the mountain and resupply it from low earth orbit.
Rescue climbers at a million bucks each as a side business.
Don’t forget they’ll have to grow their own potatoes and such in little pressurized tents heated and lit with only solar power.
Even that is too generous toward Mars. (minus 100 degrees Fahrenheit, and air pressure on Mars is only 0.6% of earth’s sea level pressure and 0.13% oxygen, while air on Everest is 1/3 of the pressure at sea level).
But while you cannot fly any known earth helicopter on Mars as has been (barely) done, yet When NASA launches its new Mars 2020 rover on a trip to the red planet in July 2020, it plans to have the Mars Helicopter, a miniature robotic aircraft, attached to it. The Mars copter's blades will spin at 2,300-2,900 revolutions per minute, about 10 times faster than Earth helicopters do. - https://science.howstuffworks.com/mars-helicopter.htm .