I have one just finished and one just starting reception.
We try to do a day pottering around at home - gives them time to do their own thing and us tune to catch up on housework/DIY/etc. So, lots of playing - Lego, Playdoh, crafts, aquabeads etc. Some TV too.
The other day we do a day out - National Trust, museum, trampoline park, kids theatre, new place, beach, bike ride, national forest...
Every 6-8 weeks we probably have a night away too - cheapo hotel/AirBnb/etc - since it lets us go further afield.
I've tried to avoid dance class and the like on a weekend, since it just ties is in too much.
And I'm not trying to be mean by saying this, but I chuckle so much at comments like "If you're anywhere near London you have endless days out made..." While I don't disagree London has a lot going on, it makes the rest of the UK sound like wasteland 😅 Londoners, I promise, museums, theatres etc do exist outside the m25 🤣🤣