Base jumping in a SRV.
Canyon Racing
Requires: Horizons, small fast ships
Location: Planetoids smaller than 500km. INOVIK A 2 A is a good example.
Activity: Find a network of canyons, then fly down them at lowest possible elevation at maximum possible speed.
Goal: Don't destroy your ship by slamming into walls/floors/other racers
Difficult because: Blasting down canyons is a tense thrill ride, and its completely up to your piloting skills to do it. Ideally, either race down the same canyon with friends, or do time-trials to see who can clear the canyon the fastest.
Landing on Archenar 3
Requires:any ship, Horizons
Location: Archenar 3
Planet has a gravity of 6.7, the goal is simply to land your ship safely, the bigger the ship, the more difficult it is.
I don't understand why you put in buggyball, but omitted buckyball races. Try to make it from Sol to Sgr A* in less than 8 hours ;-) (no, not me - have yet to go to Sgr A* even once). Or retrace any other of the past races.
For the more contemplative players: to the far rim in a sidey.
Basejumping in an SRV.
Basically find a really tall mountain with nice steep sides, drive off the top and try to survive the fall to the bottom.
More info ...
https://forums.frontier.co.uk/showthread.php?t=219250
https://forums.frontier.co.uk/showthread.php?t=225796
Edit: oops, already mentioned by Agony Aunt.
Edit #2: nice thread by the way ... repped.
Montain climbing on hi g worlds. 3 g+. You need to be good on driving to do this.
Also canyon climbing. Take a deep canyon and try to drive up from it. A challange even in low g worlds.It took me 3 hours + and I couldnt leave to take a cup of coffee. That would have sent me tumbeling down.
Enjoy. Cmdr Dave Adams
A mining bad. Take a asteriobelt in unocupied space. Take a miningship that is good armed. Go mining in the asteroidbelt. Kill everyone you find there. Go to all belts and kill all thats there. Repeat at least 3 times. And you will find that thats a challange.