We are about to go on a roadtrip. Stops in DC, Norfolk, and the Outerbanks. I expect lots of fancy walkin. Museums, Monuments, Battle Fields, Beachs and Boardwalks. My knee should hold up but I need to be better to it.
I plan on riding my bike to and from Harvard Sq. this summer. The construction alone is enough to make me leave my car at home, but the cycling will be good for my quads and easy on the joint.
Like I said in the comment below, fitness comes in spurts for me. Some of it is knee related but other times it's lack of motivation. Summer helps. Vacations help. I see good things in my future.