DO you have a park nearby, or just take a walk outside. My 20 month old loves picking up sticks or rocks, smelling flowers, jumping in puddles, throwing pegs/sticks/whatever in the chook water...

Inside ideas- A bag of pegs can be fun, 'help' to fold the washing, play in the tupperware cupboard, play drums with a wooden spoon and a stainless steel bowl, play dough, wash the windows (cloth and a spray bottle of water), put some music on & dance, pretend to be lions, make a tent with a blanket over the couch or table and have a picnic.

Outside- paintbrush and a jar of water- paint the house or deck or footpath. have a picnic outside, bubbles!