what about setting up a sort of obstacle course/cubby in the living room? put a blanket over some chairs & some toys (or tupperware containers if your DS is like mine ) and he can crawl through or even just sit there.

does he like books? we have a pile of books & half the time i don't actually read them to DS he just flicks through them & points to things which i take is a cue for me to name them.

do you have a local library that does storytime? or a local park? if the weather was nice i used to let DS just crawl round the park or push him on swings.

we used to sit outside on a blanket (in the garden but could be in a park) and he'd play with some toys. or i'd walk round the garden with him & name things & let him touch leaves or bark.