Walks are allowed for exercise, so it is a good opportunity to make the most of your local environment without the distraction of the roar of traffic. Birds are nesting, butterflies on the wing and plants are coming into flower. If you do make records make sure that they get to your local recorder (see https://www.cperc.org.uk/links.php), or send them via iRecord (but make sure you use your real name rather than an alias) or to CPERC at https://www.cperc.org.uk/submit-records/
For botanical recording, see the information at https://legacy.bas.ac.uk/met/jds/cnhs/vc29.htm which includes recording guidelines, record cards, lists of species, both common and rare, found in Cambridgeshire, and more.
Jonathan Shanklin