puzzles, bricks, duplo, sticking pictures on to paper cut out of magazines/papers, singing with clapping and other actions, bouncing on the bed, describing what you can see out of the window, eg green van, man in a hat pushing a buggy, stripey cat climbing a fence, helping to sort the washing as a game (!)
Rainy days? Put on waterproofs and wellies and go outside to jump in puddles!
My dd1 became obsessed with beads at that age - I bought a whole load from Oxfam and she used to dress up in them & put them on her teddy bears. Has to be supervised, obviously, otherwise she'd have garotted herself, but she did love it. Dressing up generally - I let her play with old scarves/hats/handbags, that sort of thing. Put a mirror at child's height so she can admire the results.