My life is like yours...we don't have car, so I cycle, take transit or walk.

Have you had your iron levels checked?

I'm not at all bothered by walking around for several hrs. in museums or galleries. I never have been but I'm a lover of such places.

Whereas my dearie finds many public buildings and office buildings exacerbate his sinus problems and literally might cause him headaches, make him tired/sleepy. For those with engineering background, some buildings are not properly constructed,.."tight building syndrom" with proper fresh air ventilation, circulation. Dearie actually can't stand air-conditioned buildings. It exhausts him abit and causes these other symptoms.

Finally for myself, after doing alot of cycling for past few years, I sometimes get BORED of walking long distances. ie. over 5 kms. Especially if the pedestrian scenery is boring and the route is totally flat. I itch to get onto a bike..to get to my destination faster and in a more freewheeling way.

Snowshoeing is different because one has to pay attention to placement of feet onto surfaces/grades, etc. and weather conditions along with changing scenery.

I have been using customized orthotics for past 10+ years in my athletic shoes and boots.