Yes, out of the house every day without fail. At that age I LOVED the routine of out in the morning, home for naptime (even if they don’t nap anymore, lunch and enforced quiet (TV) time), then out again in the afternoon, or have a friend round, or use my energy from quite time to facilitate an activity at home.
I used to do theme days once every couple of months, mainly for my benefit to make me feel like a better parent 😆 so for EG I did:
Farm Day - visit tiny little local farm in the morning, home and watch Tractor Ted on the telly or whatever, play with toy farm in the afternoon.
Dinosaur day - this one kicked my theme day idea off initially as we went somewhere in the am which happened to have a dino trail on. Home, dino book, bake dino shaped biscuits
Train day - out to mini railway, home
play with brio etc
Stuff like that!
Activities that kept my kids engaged at that age:
Kinetic sand / moonsand (look up a recipe for that, flour and baby oil) - HOURS
Drawing/painting on the windows with window paint - put tape on the windows to make stained glass pattern
Mud kitchen
Magnetiles - HOURS!