Relaxing on the weekend has many different forms, the prevalent one for me is taking time to do ME-things e.g. to paint and then possibly blog about it, to just browse the internet for random things that interest me, to go out for a walk or bicycle ride or work on a house project.
Generally speaking, I just don't put myself under the pressure I have during my workweek and I don't have a schedule to do certain things. If something gets started (or not) and not finished - I don't care. Well, I do care but it is all good.
Taking the load off, not putting oneself under the same working week pressure is the best way to deploy weekends. Even when stuff needs to get done on the weekends I guess it's different, has a different vibe or energy, and never seems as pressurised as the working week.