Depends what kind of biking you want to do ? I would like to do the Scottish offroad coast to coast eventually:

http://biking.skedaddle.co.uk/holiday/34/view.rails

The "best" bits of Scotland for cycling (IMO) would be the Highlands and Islands as the scenery is just fantastic when the clag isn't down (which is unfortunately rather often) and the midges aren't trying to eat you alive. To cycle round you would need to like hills, have plenty of insect repellent if in the main summer months (though the Scottish midge seems to be able to overcome most) and be prepared for "four seasons in one day" weatherwise, including the Scottish favourite of raining when the sun is still shining - I don't seem to see this as often now I've moved down to England.

I know people cycle tour a lot round Scotland and being born and bred there I obviously love it however I always stop short of whole heartedly encouraging people to go as the weather is so unpredictable - the same for the Welsh and English mountains, beautiful areas but seem to spend most of the time hiding in low cloud! Personally I love the unpredictable weather as it makes the good days all the more special but its a bit annoying if you've got a weeks' vacation and it rains for all of it!

Oh, stay away from the tablet its horrible! Macaroon bars on the other hand...