My DS is 15 months and we read ALOT of books, he loves those lift the flap ones so I encourage him to lift them to peek at what's underneath and turn the pages.
We also play chasings around the house or hide and seek, mostly me hiding but he LOVES finding me!
Moo has his own cupboard that is full of plastic things in the kitchen, he can spend ages taking off the lids and putting containers into other containers.
He likes playing blocks where I stack them all up in a tower and he knocks it down!
We do a lot of nursery rhyme type games like ring-a-ring-a-rosy and clapping games.
When the weather is good he loves walking up and down the verandah or poking around in the garden beds.
We've been to a couple of good play centres that are great for something different!