Youtube compresses it pretty hard... .mp4 is compressed, not familiar with the gopro settings but you should be able to keep the same quality in your editing software - video compression is a bit of an art, lots and lots of settings. What software are you using? How you set up the timeline (fps, color space, NSTC, DV-PRO, on and on....) and how you do the final render quality (frame blending, quick render, resizing, output compresion, single or double pass, VBR vs. constant, target bitrate, max and min!) I could write a book about exporting video...
The jist of it is is make sure your software can edit in native .mp4 and not have to convert the video 1000x times to edit... everytime you mess with it you lose quality. Non-pro software will generally convert it on import to whatever it was written to do, with good stuff (premiere, final cut) you can tell it to edit in the same space it was shot and save yourself lots of trouble...
I set my camera to record at max bitrate in 720p. Premiere CS5 can play and edit that in realtime (on a fairly fast PC...) then export at around ~75 compression at max render quality double pass VBR. Preserves what the camera shot very well, but then when you upload to youtube all is lost in their space saving, quick recode bullshit.
Vimeo is somewhat better in that regard, I just have more fans and followers on youtube
For the best quality you are going to have to host your own videos, all the public sites will re-code all of the hard work you put in to save space/time.
As for the ride is was awesome and stupid at the same time... I got pissed at the people I was with (I just wanted to take it easy around camp and take pics for the BMW website...) they decided to go exploring and I finally had enough and tried to go back, only to get extremely lost, bushwhack through some shit I had no business riding alone. I got soaking wet and really tired from picking the bike up - then the temp started to drop and I got mild hypothermia... fucking stupid fucks left and took my dry thermal layer form the campsite I was really looking forward to getting into before I you know, died... had to ditch the bike and hitch a ride home in a truck. lol so much for an easy weekend. Video to post soon