Skiing – hire snow shoes which are almost as much fun as skiing, but lessen the chance of doing damage if you fall over. (And lessen the chance of falling over.)
Housework
Freeze a big cookup and keep in the freezer for when you have chemotherapy, and are not feeling well. Ignore housecleaning – spend your days doing stuff you enjoy. If the housecleaning is too much employ domestic help, or ask family or friends to assist.
