wow, great story. A 6 month cycling tour sounds awesome, assuming your knee is back up for the challenge. It sounds like you've been doing great and know how to stay health. Like Ron said, compound moves will help out a bunch. Don't be afraid of weights, is also good advice.
Taking pictures is also great, we'll be looking for 6 months worth of pictures when you get back from Asia, so you've been warned... bring your camera and plenty of memory cards!