If we are able to land on Halley's comet it will break how fast humans have gone. No energy needed to travel within our solar system. Yes it does get close to the sun but considering that the comet is ice, has its own gravitational influence as well as staying on the far side of the comet, it shouldn't be a problem. Really I don't know why it hasn't been talked about. If we can master wireless electricity, it could come in handy but thats another subject.
Answers (1)
The comet doesn't maintain a steady speed, it only speeds up as it heads closer to the Sun.
As it moves away from the Sun it slows until it finally falls back to the Sun once more, the whole orbital period is 75 years and 4 months, It will be back in 2060/61.
Halley's comet is bombarded by massive amounts of radiation from the Sun all the way in and all the way out, there is nothing to eat or drink on the comet either, 75ish years is a long tour and most of it very slowly. Approaching the Sun the temperature rises from -200 C to over 600 C. The "far side" of Halley's comet (to shelter from the Sun's rays) is also problematic as there isn't one, the comet spins, all sides face the sun regularly, but the radiation will pass right through any time of day.
The only hitch-hiking in space can be found in Douglas Adam's books (sorry, a nice idea though!).
Like I said, your idea was an interesting one and does have merit (It is now one of my favourites).
Although riding Halley's comet would seem an impossibility, it is an interesting exercise, so thank you for asking.
Makes sense, I am surprised i actually got a legit answer so thank you for that.