Long lie in.
Looong hot shower, getting thoroughly clean, doing a conditioning treatment on hair, followed by actually using body lotion, drying hair properly etc.
Go out for good long walk.
Buy nice food in deli for later, including some kind of nice (but slightly healthy) bun or cake
Do some knitting, sewing or other crafting
Have a nice dinner watching rubbish tv or a decent Netflix movie
Long hot bath to relieve sore muscles
Sleep
Go into town for nice coffee and breakfast
Massage
Go to art gallery or movie or theatre event
Have a glass of nice wine before coming home (whether before or after said cultural event)
Another nice dinner
Sleep some more....
OK - reality is I'd probably do loads of housework and maintenance jobs, empty freezer, do a batch cooking to refill it, do a big grocery shop, sort laundry mini-mountain, clear out cupboards...all those kinds of jobs.
I have gone to a hotel once for a solo overnight and it was bliss.
And once a year (most years), I manage to get to see a play alone. But that's about it on culture stuff....
Sleep more