If you don't want to ferry your kids to activities all weekend, don't book them.
My kids do 2 sports activities each after school during the week, for childcare mainly but they also enjoy them and get exercise. I have never given them the option of 9am clubs on the weekend because we would all prefer to relax. Swimming is done as an intensive course in the summer holidays.
Our weekends consist of lazy mornings, trundling to the bakery or to M&S for some treat food (not a full weekly shop). Watching films, going to the beach, inviting friends round for a bbq or going out for lunch, cinema, swimming at the fun pool with waterslides, pony riding lessons every few weeks, adventure playground, baking, gardening. We do some stuff all together and other things are better suited to one child so we split up.
DS has a party to go to tomorrow so I'll drop him there, go for a swim on my own then collect him. DD and DH want to build lego so they'll stay at home. Sunday will be driving to a new park and getting a roast at a pub. Home for a film.