We had a large garden, so we gardened. Small children so in summer a paddling pool out, DC played with neighbours DC, took bikes out when older. We got up late and read the Sunday paper (delivered) and had breakfast outside. BBQ in the garden sometimes. Gardening. Ex-H did lesson prep as he was a teacher. Went to the park (fed horses on way, ducks there when DC v. small), drove out to local amusement park (waterslides, small dipper, rides, picnic areas etc) or to local country park (played croquet, had a picnic, long walks, small workshops to shop at even on a Sunday - independent small traders). In winter, playing in garden (esp if snow), park etc. meals, papers, TV the same (watched Sunday serial on BBC). Read books.
Had 'picky tea' watching Antiques Roadshow, preceded by a Sunday lunch (cooked by me from scratch, vegetarian so not trad roast).
Actually, much what my DD, DSS and DS and assorted DGC do on Sundays (though DS tends to take DGS, who is into mountain biking, on long bike rides) now. (Except for Antiques Roadshow, sadly.) Various DGC do activities (one DGD is in to acting and dance - family trait). DGD plays tennis at the court in local park - pub later. DD and her DP sometimes go out to breakfast, which is new (always to place where DDog welcome).
All of us work hard so have very little desire to go shopping (except DGD occasionally - but she works Saturdays most weeks), go to anything energetic on a Sunday. Rare to go out to meals.
As far as I remember by late 80s cinemas were open.
Museums were shut on Sundays. That they, and pubs, are open now I think a great improvement, but staff should be able to have 2 consecutive days off.
In my youth (60s) Sundays meant 'Going for a Song' (pre-curser of Antiques Road Show), 'All Our Yesterdays', playing with toys and reading, DBs playing out with friends. Sunday serial on BBC (DP into arts and history, so watched any arts programme, history programme etc).