A new challenge

[Clockwork13]

As we all know, getting to all of the planets is quite easy if you are relatively experienced. Scott Manley could practically get to Eeloo with a ship entirely made of SRB's. So that brings up this suggestion. We need a new, harder planet. Something that poses an extreme challenge to get to. A planet that represents Sedna and is up to 5 times farther from Kerbol than Eeloo. The first challenge is getting as far as that. The second challenge is getting into orbit. Sedna would be slightly smaller than Eeloo, and have a much smaller SOI. This means you'd probably first need to get close to Sedna then keep making maneuvers until you get an encounter. The final challenge is landing. Sedna would have small oceans of ice, which are bad for landing as your ship may slide around and tip over. It does have a couple areas of abundant land which have flat-ish terrain which is good for landing. Then you just need to land safely like any other planet.

[jfx]

Something like you described would just impose artificial difficulty aka patience while waiting for a burn/intercept and fine tuning of maneuver nodes which is already abysmal without mods.

The basic challenge (match planes / Hohmann it/ fine tuning) would be exactly the same as for Eelo etc.

[Technical Ben]

Something more like recovery of a specific rock on a specific (existing) planet is more like a "challenge". Fuel and time are not a real challenge, just a bit of patience, and all the stats in the world just boil down to fuel and time.

So something with skill or planning would be specific flight locations, landings and or fly bys. Such as "Misson for tour of 2 Jool moons" or "return rocks from Minmus". Once something along the lines of re-entry heat or Life support are added, things will be REALLY challenging.

[pellinor]

Actually far out only means just more time warp. As the suns gravity is weak out there, it also means you need just a bit more fuel and Planets have larger SOIs.

If you look for a hard-to-get place, I'd go for low kerbol orbits with extreme inclination/eccentricity.