Little tykes can come indoors. Pile up some pillows on the floor and let the kids run and jump on them. Take 2 old blankets and stitch 3 edges together.
Kids can flop down on it and use it for all sorts of play activities.
Fill old Wet Wipe containers with pop corn kernals. A large house plants scooter on rollers covered it with carpet using a staple gun makes a great basement scooter. Purchase on of those hammock porch swings for reading and snuggling Trampoline Tramps with the handles on the side are quite dangerous as the child will keep falling into it. Purchase a cheaper one without the handles and place the tramp under a rope tied to the ceiling attached to one of those swivel mechanisms for hanging net bags, swings, platform swings, etc. Put the little trampoline under that with the little trapeze, the child can jump up and down holding onto the trapeze.