M.D.
Do you have space to put a small plastic playset indoors? In my house, I made space for a toddler size basketball hoop in the living room. A friend of mine put a Little Tykes toddler slide with climbing wall in her living room (like this: https://www.littletikes.com/item/630286/hide-seek-climber...) . You can often find these at thrift shops this time of year, because people are getting rid of them before winter.
We also had a nylon play tent with a crawling tunnel. Kids loved that and it was easy to fold up and store afterwards (actually, my kids are waaaay past toddler age now, and they still pull it out sometimes).