I'm not sure how I missed this since I love all things Iceland... but yeah, this kicks ass! I recognize quite a few spots both on your MTB tour and your other adventures. That waterfall in Skaftafell NP is Svartifoss, btw. ;)
How did you like riding with Icebike? Was the whole trip fully taken care of, or did you just do several "day trips" while based in Reykjavik?