Just getting to mars isn’t the end point though, is it?
Developing the technologies that will enable us to get to Mars will bring far more gains than what we do on Mars.
It’s a pretty inhospitalble place, despite what the Pop-sci brigade would have us believe, Bugger all atmosphere to use, for a start. Then there’s radiation levels well beyond anything a human can tolerate long term, even in suits and shielded habitats you’ll be carrying the dust in with you which you can’t just wash off easily.
The best we could hope for is a manned mission that orbits and sends down lots of robots and drones that they control directly to do the interesting stuff more efficiently than the current ones. The time delay limits our interaction with the current explorers massively, though they have done amazing things up there.
The moon was only visited a handful of times as the cost of getting there didn’t justify what we could find out about the place, sorry to burst the bubble, but scientifically speaking, it’s just not that interesting.