Way to go with the amazing walking and taking on bike riding, Norm. That's something I look forward to doing in the future when my knees can handle it. For now, I workout in a pool and love it. Being out zipping about on a bike sounds really invigorating - though it's been so long I think I might be falling down more than traveling much distance. We have a great bike trail not to far from where I live and that would be a traffic-free place for me to ride and fall if that's the case.
I notice that you and I are at similar weight points as far as eating lots of nutritious fruits, veggies, beans and grains have helped with losing weight. I began at 433 and am now at 270. My weight goal is 130, but living this healthy lifestyle is my forever goal. Losing the weight is just a lovely side-effect.
Just wanted to say Bravo! and thanks for the bike-riding inspiration.
Have you tried bike riding with your knee Kris? I find if seat is in right spot for me that it is better on my knees then walking is. Might try moving seat around and see what happens.