I find it important to have a routine, so on the 4 days a week my wife works, I get up with her at 7am, and walk the dog for an hour at 7:30am (she gives him a second walk when she gets in from work around 4pm), and on the other 3 days we lay in until 8am, then as normal - I have set myself a rotation of tasks that need done weekly/fortnightly (such as cleaning rooms on a rota, window washing, gardening), so try to do one of those a day, to vary things.
I divide the rest of my day between some time on here, and I allow myself an hour or two a day just following interesting looking links on the web, two hours a day (or more) reading (news, fiction, magazine), general tidying up and cooking, and I deliver food from the local church/parish council to retired people who can't get out their houses, and have registered with the local RAFA branch to do some more voluntary work (nothing has come from that yet), and also just (I was sent some info from a ex-military FB page I follow) enrolled with
Team Rubicon, an organisation for veterans to do volunteering in their local areas.
I manage to keep occupied, but occasionally just have a lazy day and watch some films.